<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019ef4b5-dfc0-7500-af8e-d2fe53eddda4,g:408872d5-2d34-4368-a56a-5ae49f9e37c6-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.athene.com/role/CoverPage" xlink:type="simple" xlink:href="ahl-20260630.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019ef4b5-eaea-711d-81c1-2c1cb14486fa" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_DocumentInformationTable_019ef4b5-eaea-711d-81c1-2c1cb14486fa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019ef4b5-eaea-7861-84f3-d1702a4883ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019ef4b5-eaea-711d-81c1-2c1cb14486fa" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019ef4b5-eaea-7861-84f3-d1702a4883ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ef4b5-eaea-7861-84f3-d1702a4883ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ef4b5-eaea-7861-84f3-d1702a4883ea" xlink:to="loc_us-gaap_ClassOfStockDomain_019ef4b5-eaea-7861-84f3-d1702a4883ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ef4b5-eaea-7565-a054-8ddff9aaeb7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ef4b5-eaea-7861-84f3-d1702a4883ea" xlink:to="loc_us-gaap_ClassOfStockDomain_019ef4b5-eaea-7565-a054-8ddff9aaeb7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_019ef4b5-eaea-7e17-a73b-a2a687029648" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ef4b5-eaea-7565-a054-8ddff9aaeb7b" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_019ef4b5-eaea-7e17-a73b-a2a687029648" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesBPreferredStockMember_019ef4b5-eaea-75e9-9281-5d1dbc51e497" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesBPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ef4b5-eaea-7565-a054-8ddff9aaeb7b" xlink:to="loc_us-gaap_SeriesBPreferredStockMember_019ef4b5-eaea-75e9-9281-5d1dbc51e497" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesDPreferredStockMember_019ef4b5-eaea-7883-83f1-6f099f34e673" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesDPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ef4b5-eaea-7565-a054-8ddff9aaeb7b" xlink:to="loc_us-gaap_SeriesDPreferredStockMember_019ef4b5-eaea-7883-83f1-6f099f34e673" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesEPreferredStockMember_019ef4b5-eaea-73f4-8e23-078d961fd0bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesEPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ef4b5-eaea-7565-a054-8ddff9aaeb7b" xlink:to="loc_us-gaap_SeriesEPreferredStockMember_019ef4b5-eaea-73f4-8e23-078d961fd0bd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_JuniorSubordinatedDebtMember_019ef4b5-eaea-77b3-8364-6fab04402311" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_JuniorSubordinatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ef4b5-eaea-7565-a054-8ddff9aaeb7b" xlink:to="loc_us-gaap_JuniorSubordinatedDebtMember_019ef4b5-eaea-77b3-8364-6fab04402311" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019ef4b5-eaea-7475-97ab-5188fe6157b0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_DocumentType_019ef4b5-eaea-7475-97ab-5188fe6157b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019ef4b5-eaea-79bd-b8a5-1e4a12caca3f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_DocumentQuarterlyReport_019ef4b5-eaea-79bd-b8a5-1e4a12caca3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019ef4b5-eaeb-7a53-8c7c-1b70aa9f05a2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_DocumentPeriodEndDate_019ef4b5-eaeb-7a53-8c7c-1b70aa9f05a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019ef4b5-eaeb-7c6a-bb32-59a80210932b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_DocumentTransitionReport_019ef4b5-eaeb-7c6a-bb32-59a80210932b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019ef4b5-eaeb-7695-95aa-0457288abeb1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityFileNumber_019ef4b5-eaeb-7695-95aa-0457288abeb1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019ef4b5-eaeb-7329-902a-cb9868d4c373" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityRegistrantName_019ef4b5-eaeb-7329-902a-cb9868d4c373" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019ef4b5-eaeb-7471-90be-b4b7bc3569db" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019ef4b5-eaeb-7471-90be-b4b7bc3569db" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019ef4b5-eaeb-75c7-9d4c-d42d9a48b783" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityTaxIdentificationNumber_019ef4b5-eaeb-75c7-9d4c-d42d9a48b783" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019ef4b5-eaeb-7cc5-8f76-258f0b58df3a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityAddressAddressLine1_019ef4b5-eaeb-7cc5-8f76-258f0b58df3a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019ef4b5-eaeb-7d99-b8aa-790e29846d8c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityAddressCityOrTown_019ef4b5-eaeb-7d99-b8aa-790e29846d8c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019ef4b5-eaeb-7ed2-a5b3-124454700fbf" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityAddressPostalZipCode_019ef4b5-eaeb-7ed2-a5b3-124454700fbf" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019ef4b5-eaeb-70a6-9217-75fcffe24d2a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_CityAreaCode_019ef4b5-eaeb-70a6-9217-75fcffe24d2a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019ef4b5-eaeb-7a90-a3a6-37d8b760d244" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_LocalPhoneNumber_019ef4b5-eaeb-7a90-a3a6-37d8b760d244" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019ef4b5-eaeb-71ec-871b-bc05d267c898" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_Security12bTitle_019ef4b5-eaeb-71ec-871b-bc05d267c898" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019ef4b5-eaeb-7532-83c2-6cea4aed1c27" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_TradingSymbol_019ef4b5-eaeb-7532-83c2-6cea4aed1c27" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019ef4b5-eaeb-7c48-8a3b-d7eb6119329c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_SecurityExchangeName_019ef4b5-eaeb-7c48-8a3b-d7eb6119329c" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019ef4b5-eaeb-7167-ae49-3f274301456a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityCurrentReportingStatus_019ef4b5-eaeb-7167-ae49-3f274301456a" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019ef4b5-eaeb-7b39-aafa-a887116387ee" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityInteractiveDataCurrent_019ef4b5-eaeb-7b39-aafa-a887116387ee" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019ef4b5-eaeb-79c3-b4ce-84a81551b1a1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityFilerCategory_019ef4b5-eaeb-79c3-b4ce-84a81551b1a1" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019ef4b5-eaeb-7bb5-af65-8dd70c138b11" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntitySmallBusiness_019ef4b5-eaeb-7bb5-af65-8dd70c138b11" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019ef4b5-eaeb-7fa8-8985-699ee24386f7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityEmergingGrowthCompany_019ef4b5-eaeb-7fa8-8985-699ee24386f7" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019ef4b5-eaeb-7311-a3d1-d23082146be6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityShellCompany_019ef4b5-eaeb-7311-a3d1-d23082146be6" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019ef4b5-eaeb-7e5e-a740-7861156073cc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019ef4b5-eaeb-7e5e-a740-7861156073cc" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019ef4b5-eaeb-7019-92ab-b3596e838098" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityCentralIndexKey_019ef4b5-eaeb-7019-92ab-b3596e838098" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019ef4b5-eaeb-7feb-a883-8729e811ede9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_DocumentFiscalYearFocus_019ef4b5-eaeb-7feb-a883-8729e811ede9" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019ef4b5-eaeb-7e01-b9d9-64d11577e311" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019ef4b5-eaeb-7e01-b9d9-64d11577e311" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019ef4b5-eaeb-7120-bb3f-303fa53ac393" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_CurrentFiscalYearEndDate_019ef4b5-eaeb-7120-bb3f-303fa53ac393" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019ef4b5-eaeb-7f42-9b51-30614e2bd935" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_AmendmentFlag_019ef4b5-eaeb-7f42-9b51-30614e2bd935" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019ef4b5-eaeb-7e8e-bba9-56d5bc82694f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ef4b5-eaea-7d7d-b6ee-bca053e005e8" xlink:to="loc_dei_EntityAddressStateOrProvince_019ef4b5-eaeb-7e8e-bba9-56d5bc82694f" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/CondensedConsolidatedBalanceSheets" xlink:type="simple" xlink:href="ahl-20260630.xsd#CondensedConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019ef4b5-eaeb-7a02-9694-eecfe88cb1d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019ef4b5-eaeb-7fe0-93db-126d77b15875" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eaeb-7a02-9694-eecfe88cb1d6" xlink:to="loc_us-gaap_StatementTable_019ef4b5-eaeb-7fe0-93db-126d77b15875" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eaeb-72e4-8a06-074dd075cab0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ef4b5-eaeb-7fe0-93db-126d77b15875" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eaeb-72e4-8a06-074dd075cab0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eaeb-72e4-8a06-074dd075cab0_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eaeb-72e4-8a06-074dd075cab0" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eaeb-72e4-8a06-074dd075cab0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eaeb-7d30-8b7d-1922ace18041" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eaeb-72e4-8a06-074dd075cab0" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eaeb-7d30-8b7d-1922ace18041" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eaeb-7e94-b067-f07be1e74309" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eaeb-7d30-8b7d-1922ace18041" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eaeb-7e94-b067-f07be1e74309" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-eaeb-7950-9298-1956026ba72a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eaeb-7d30-8b7d-1922ace18041" xlink:to="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-eaeb-7950-9298-1956026ba72a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eaeb-77fe-8ce6-61f59402fe8b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eaeb-7d30-8b7d-1922ace18041" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eaeb-77fe-8ce6-61f59402fe8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eaeb-791b-9316-43d29d02a042" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eaeb-7d30-8b7d-1922ace18041" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eaeb-791b-9316-43d29d02a042" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityAffiliatedEntityAndVIEPrimaryBeneficiaryMember_019faa31-d8ca-7bed-bd44-0e05858e2970" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityAffiliatedEntityAndVIEPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eaeb-7d30-8b7d-1922ace18041" xlink:to="loc_ahl_ConsolidatedEntityAffiliatedEntityAndVIEPrimaryBeneficiaryMember_019faa31-d8ca-7bed-bd44-0e05858e2970" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eaeb-7a02-9694-eecfe88cb1d6" xlink:to="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:to="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-eaeb-75ad-899b-2fad15ee7d00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-eaeb-75ad-899b-2fad15ee7d00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_019ef4b5-eaeb-7600-8a86-af4fb243f9d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_TradingSecuritiesDebt_019ef4b5-eaeb-7600-8a86-af4fb243f9d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue_019ef4b5-eaeb-7e3d-93a9-6321defa053f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue_019ef4b5-eaeb-7e3d-93a9-6321defa053f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_019ef4b5-eaeb-7d11-88f6-a8f52f5af218" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_019ef4b5-eaeb-7d11-88f6-a8f52f5af218" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-eaeb-779e-9a7e-1ed14e9e7d39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-eaeb-779e-9a7e-1ed14e9e7d39" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFunds_019ef4b5-eaeb-7290-a87f-6735587b6c53" xlink:href="ahl-20260630.xsd#ahl_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_ahl_InvestmentFunds_019ef4b5-eaeb-7290-a87f-6735587b6c53" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsurancePolicy_019ef4b5-eaeb-789d-8a33-cd3d64cc9237" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansInsurancePolicy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_LoansInsurancePolicy_019ef4b5-eaeb-789d-8a33-cd3d64cc9237" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsAsset_019ef4b5-eaeb-7225-8d7a-981a36afe7e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FundsHeldUnderReinsuranceAgreementsAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsAsset_019ef4b5-eaeb-7225-8d7a-981a36afe7e1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019ef4b5-eaeb-7ba6-9f64-709b17a553fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_DerivativeAssets_019ef4b5-eaeb-7ba6-9f64-709b17a553fa" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019ef4b5-eaeb-74ad-a7af-d5b3e44aed13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_ShortTermInvestments_019ef4b5-eaeb-74ad-a7af-d5b3e44aed13" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019ef4b5-eaeb-7dc6-9bcb-c32f6c13c3d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_OtherInvestments_019ef4b5-eaeb-7dc6-9bcb-c32f6c13c3d3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019ef4b5-eaeb-7fc8-b11c-389a40bd6796" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019ef4b5-eaeb-7bab-bba6-68862d95e7d3" xlink:to="loc_us-gaap_Investments_019ef4b5-eaeb-7fc8-b11c-389a40bd6796" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019ef4b5-eaeb-730a-8ad2-91cef3639acd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019ef4b5-eaeb-730a-8ad2-91cef3639acd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019ef4b5-eaeb-75c2-9420-7e9426ed1661" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019ef4b5-eaeb-75c2-9420-7e9426ed1661" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedInvestmentIncomeReceivable_019ef4b5-eaeb-7bae-900d-b2d3540fa548" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedInvestmentIncomeReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:to="loc_us-gaap_AccruedInvestmentIncomeReceivable_019ef4b5-eaeb-7bae-900d-b2d3540fa548" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_019ef4b5-eaeb-7f63-b4c1-eb6a3c8c13f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:to="loc_us-gaap_ReinsuranceRecoverables_019ef4b5-eaeb-7f63-b4c1-eb6a3c8c13f0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfits_019ef4b5-eaeb-7c31-a8cd-bd4e8eab4b03" xlink:href="ahl-20260630.xsd#ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:to="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfits_019ef4b5-eaeb-7c31-a8cd-bd4e8eab4b03" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019ef4b5-eaeb-7d48-9184-fc5dc09a4081" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:to="loc_us-gaap_Goodwill_019ef4b5-eaeb-7d48-9184-fc5dc09a4081" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019ef4b5-eaeb-7b01-b728-cb33dd5d5202" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:to="loc_us-gaap_OtherAssets_019ef4b5-eaeb-7b01-b728-cb33dd5d5202" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019ef4b5-eaeb-79ec-a541-de5823c1d445" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eaeb-74a1-affc-56814d6a630e" xlink:to="loc_us-gaap_Assets_019ef4b5-eaeb-79ec-a541-de5823c1d445" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eaeb-7572-80c0-9b724e8795a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eaeb-7a02-9694-eecfe88cb1d6" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eaeb-7572-80c0-9b724e8795a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019ef4b5-eaeb-73f2-8ed4-71c9e3ed84f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eaeb-7572-80c0-9b724e8795a7" xlink:to="loc_us-gaap_LiabilitiesAbstract_019ef4b5-eaeb-73f2-8ed4-71c9e3ed84f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-eaeb-75e5-84cb-000674da54c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderContractDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ef4b5-eaeb-73f2-8ed4-71c9e3ed84f7" xlink:to="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-eaeb-75e5-84cb-000674da54c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019ef4b5-eaeb-79dc-af60-12256b7ba10c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ef4b5-eaeb-73f2-8ed4-71c9e3ed84f7" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019ef4b5-eaeb-79dc-af60-12256b7ba10c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019ef4b5-eaeb-7a43-a2e1-da7d0fce4e06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ef4b5-eaeb-73f2-8ed4-71c9e3ed84f7" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019ef4b5-eaeb-7a43-a2e1-da7d0fce4e06" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019ef4b5-eaeb-7524-b1c6-b6c25ffeabd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ef4b5-eaeb-73f2-8ed4-71c9e3ed84f7" xlink:to="loc_us-gaap_LongTermDebt_019ef4b5-eaeb-7524-b1c6-b6c25ffeabd0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019ef4b5-eaeb-7b85-a8f9-ebd13818b9c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ef4b5-eaeb-73f2-8ed4-71c9e3ed84f7" xlink:to="loc_us-gaap_DerivativeLiabilities_019ef4b5-eaeb-7b85-a8f9-ebd13818b9c1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentRelatedLiabilities_019ef4b5-eaeb-7a2d-b600-39280de1df99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentRelatedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ef4b5-eaeb-73f2-8ed4-71c9e3ed84f7" xlink:to="loc_us-gaap_InvestmentRelatedLiabilities_019ef4b5-eaeb-7a2d-b600-39280de1df99" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019ef4b5-eaeb-7ac7-86ab-a6948befe016" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ef4b5-eaeb-73f2-8ed4-71c9e3ed84f7" xlink:to="loc_us-gaap_OtherLiabilities_019ef4b5-eaeb-7ac7-86ab-a6948befe016" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019ef4b5-eaeb-73fb-96e4-1ecd7bc277a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ef4b5-eaeb-73f2-8ed4-71c9e3ed84f7" xlink:to="loc_us-gaap_Liabilities_019ef4b5-eaeb-73fb-96e4-1ecd7bc277a4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019ef4b5-eaeb-7c56-9a7f-405d23971c1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eaeb-7572-80c0-9b724e8795a7" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019ef4b5-eaeb-7c56-9a7f-405d23971c1a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019ef4b5-eaeb-7e1c-bf5f-5d17d27f62b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eaeb-7572-80c0-9b724e8795a7" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019ef4b5-eaeb-7e1c-bf5f-5d17d27f62b1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValueOutstanding_019ef4b5-eaeb-7add-a0a0-2de4e0fc1fd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockValueOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019ef4b5-eaeb-7e1c-bf5f-5d17d27f62b1" xlink:to="loc_us-gaap_PreferredStockValueOutstanding_019ef4b5-eaeb-7add-a0a0-2de4e0fc1fd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValueOutstanding_019ef4b5-eaeb-7b67-8479-01806b4464ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValueOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019ef4b5-eaeb-7e1c-bf5f-5d17d27f62b1" xlink:to="loc_us-gaap_CommonStockValueOutstanding_019ef4b5-eaeb-7b67-8479-01806b4464ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019ef4b5-eaeb-7627-b4fc-1053752f7ccb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019ef4b5-eaeb-7e1c-bf5f-5d17d27f62b1" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019ef4b5-eaeb-7627-b4fc-1053752f7ccb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019ef4b5-eaeb-7310-87a4-5ec8f306fa3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019ef4b5-eaeb-7e1c-bf5f-5d17d27f62b1" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019ef4b5-eaeb-7310-87a4-5ec8f306fa3f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019ef4b5-eaeb-7734-8e17-020bf3f5bf14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019ef4b5-eaeb-7e1c-bf5f-5d17d27f62b1" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019ef4b5-eaeb-7734-8e17-020bf3f5bf14" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019ef4b5-eaeb-7f4c-b823-9b200e24d9c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019ef4b5-eaeb-7e1c-bf5f-5d17d27f62b1" xlink:to="loc_us-gaap_StockholdersEquity_019ef4b5-eaeb-7f4c-b823-9b200e24d9c2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_019ef4b5-eaeb-7fd7-ab82-0604a1ad93c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019ef4b5-eaeb-7e1c-bf5f-5d17d27f62b1" xlink:to="loc_us-gaap_MinorityInterest_019ef4b5-eaeb-7fd7-ab82-0604a1ad93c4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ef4b5-eaeb-7345-98c5-588e997e21b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019ef4b5-eaeb-7e1c-bf5f-5d17d27f62b1" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ef4b5-eaeb-7345-98c5-588e997e21b8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019ef4b5-eaeb-70df-86b9-4d990da16706" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eaeb-7572-80c0-9b724e8795a7" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019ef4b5-eaeb-70df-86b9-4d990da16706" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="ahl-20260630.xsd#CondensedConsolidatedBalanceSheetsParenthetical"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7054-b2a8-425479454597" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019ef4b5-eba0-7bcb-bbc0-92aecccd7838" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7054-b2a8-425479454597" xlink:to="loc_us-gaap_StatementTable_019ef4b5-eba0-7bcb-bbc0-92aecccd7838" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019ef4b5-eba0-7f36-a8b6-dc02a9bf38ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ef4b5-eba0-7bcb-bbc0-92aecccd7838" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019ef4b5-eba0-7f36-a8b6-dc02a9bf38ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019ef4b5-eba0-7f36-a8b6-dc02a9bf38ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019ef4b5-eba0-7f36-a8b6-dc02a9bf38ea" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019ef4b5-eba0-7f36-a8b6-dc02a9bf38ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019ef4b5-eba0-764f-bdd1-743978c853dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019ef4b5-eba0-7f36-a8b6-dc02a9bf38ea" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019ef4b5-eba0-764f-bdd1-743978c853dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019ef4b5-eba0-7380-bb75-a9b98575a1b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019ef4b5-eba0-764f-bdd1-743978c853dd" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019ef4b5-eba0-7380-bb75-a9b98575a1b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-eba1-792c-860a-d34bac4e08c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ef4b5-eba0-7bcb-bbc0-92aecccd7838" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-eba1-792c-860a-d34bac4e08c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-eba1-792c-860a-d34bac4e08c4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-eba1-792c-860a-d34bac4e08c4" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-eba1-792c-860a-d34bac4e08c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-eba1-7797-99dd-1f37add782cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-eba1-792c-860a-d34bac4e08c4" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-eba1-7797-99dd-1f37add782cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-eba1-712c-a852-1b08e45ca1ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-eba1-7797-99dd-1f37add782cc" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-eba1-712c-a852-1b08e45ca1ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019ef4b5-eba1-7b03-ba52-d34bf23dd0bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-eba1-712c-a852-1b08e45ca1ee" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019ef4b5-eba1-7b03-ba52-d34bf23dd0bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-78e5-ada5-4755b0edc2a1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ef4b5-eba0-7bcb-bbc0-92aecccd7838" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-78e5-ada5-4755b0edc2a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-78e5-ada5-4755b0edc2a1_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-78e5-ada5-4755b0edc2a1" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-78e5-ada5-4755b0edc2a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-775f-8194-274ac69a59da" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-78e5-ada5-4755b0edc2a1" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-775f-8194-274ac69a59da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-71c9-8348-37a7e3113fc4" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-775f-8194-274ac69a59da" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-71c9-8348-37a7e3113fc4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7540-bee5-7cf9f467feff" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-775f-8194-274ac69a59da" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7540-bee5-7cf9f467feff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityAffiliatedEntityAndVIEPrimaryBeneficiaryMember_019ef4b5-eba1-739b-b1a4-a50b7abeecfd" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityAffiliatedEntityAndVIEPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-775f-8194-274ac69a59da" xlink:to="loc_ahl_ConsolidatedEntityAffiliatedEntityAndVIEPrimaryBeneficiaryMember_019ef4b5-eba1-739b-b1a4-a50b7abeecfd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-71e9-a7c2-f86e26c60b3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-775f-8194-274ac69a59da" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-71e9-a7c2-f86e26c60b3c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7054-b2a8-425479454597" xlink:to="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019ef4b5-eba1-78af-9e31-df31a9b31e60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019ef4b5-eba1-78af-9e31-df31a9b31e60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019ef4b5-eba1-7128-b511-910dd8f9309b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019ef4b5-eba1-7128-b511-910dd8f9309b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset_019ef4b5-eba1-7ca1-b65d-710b873497b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset_019ef4b5-eba1-7ca1-b65d-710b873497b0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019ef4b5-eba1-79ee-b3ff-7170bbb934f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_ShortTermInvestments_019ef4b5-eba1-79ee-b3ff-7170bbb934f5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019ef4b5-eba1-7150-ae3b-cf016da1a113" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_OtherInvestments_019ef4b5-eba1-7150-ae3b-cf016da1a113" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AlternativeInvestment_019ef4b5-eba1-7971-b383-8fe00f6179ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AlternativeInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_AlternativeInvestment_019ef4b5-eba1-7971-b383-8fe00f6179ab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedInvestmentIncomeReceivable_019ef4b5-eba1-7bb6-adda-cbb97b69f84d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedInvestmentIncomeReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_AccruedInvestmentIncomeReceivable_019ef4b5-eba1-7bb6-adda-cbb97b69f84d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_019ef4b5-eba1-791c-a1dd-d2ce98e9b94f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_ReinsuranceRecoverables_019ef4b5-eba1-791c-a1dd-d2ce98e9b94f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019ef4b5-eba1-7e46-8edb-13295dce3b26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_OtherAssets_019ef4b5-eba1-7e46-8edb-13295dce3b26" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_019ef4b5-eba1-73bc-9d93-1b13d429fbf9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_TradingSecuritiesDebt_019ef4b5-eba1-73bc-9d93-1b13d429fbf9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-eba1-7f1a-b0de-2398c4ba95bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-eba1-7f1a-b0de-2398c4ba95bb" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFunds_019ef4b5-eba1-70ea-b829-23cb35e0cfeb" xlink:href="ahl-20260630.xsd#ahl_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_ahl_InvestmentFunds_019ef4b5-eba1-70ea-b829-23cb35e0cfeb" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019ef4b5-eba1-7a3f-b420-4cd37d58d275" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ef4b5-eba1-7a6d-80f6-3ece1a9ef03b" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019ef4b5-eba1-7a3f-b420-4cd37d58d275" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eba1-7ad6-a107-a1b25f37bf25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7054-b2a8-425479454597" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eba1-7ad6-a107-a1b25f37bf25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-eba1-7ab9-a037-8840c73a652d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderContractDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eba1-7ad6-a107-a1b25f37bf25" xlink:to="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-eba1-7ab9-a037-8840c73a652d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019ef4b5-eba1-7183-8b13-01b9501b3cb6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eba1-7ad6-a107-a1b25f37bf25" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019ef4b5-eba1-7183-8b13-01b9501b3cb6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019ef4b5-eba1-7fdd-b5ba-88fb434c039b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eba1-7ad6-a107-a1b25f37bf25" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019ef4b5-eba1-7fdd-b5ba-88fb434c039b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019ef4b5-eba1-7b3c-bb74-993c37ed1265" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eba1-7ad6-a107-a1b25f37bf25" xlink:to="loc_us-gaap_OtherLiabilities_019ef4b5-eba1-7b3c-bb74-993c37ed1265" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019ef4b5-eba1-7423-b80b-4ce55075b163" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ef4b5-eba1-7ad6-a107-a1b25f37bf25" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019ef4b5-eba1-7423-b80b-4ce55075b163" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/CondensedConsolidatedStatementsofIncome" xlink:type="simple" xlink:href="ahl-20260630.xsd#CondensedConsolidatedStatementsofIncome"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/CondensedConsolidatedStatementsofIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019ef4b5-eba1-7b97-8335-a518249dded2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:to="loc_us-gaap_StatementTable_019ef4b5-eba1-7b97-8335-a518249dded2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7f9a-95ea-6dca759fef12" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ef4b5-eba1-7b97-8335-a518249dded2" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7f9a-95ea-6dca759fef12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7f9a-95ea-6dca759fef12_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7f9a-95ea-6dca759fef12" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7f9a-95ea-6dca759fef12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7898-ab1c-5d2081631f58" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7f9a-95ea-6dca759fef12" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7898-ab1c-5d2081631f58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-eba1-727a-a4e5-189eaaf9e31f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7898-ab1c-5d2081631f58" xlink:to="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-eba1-727a-a4e5-189eaaf9e31f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-7e25-a5ef-60577ef94333" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7898-ab1c-5d2081631f58" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-7e25-a5ef-60577ef94333" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_019ef4b5-eba1-7ee8-a8be-52e0be931eef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:to="loc_us-gaap_RevenuesAbstract_019ef4b5-eba1-7ee8-a8be-52e0be931eef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_019ef4b5-eba1-71cf-a94c-b56d87315a41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ef4b5-eba1-7ee8-a8be-52e0be931eef" xlink:to="loc_us-gaap_PremiumsEarnedNet_019ef4b5-eba1-71cf-a94c-b56d87315a41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceCommissionsAndFees_019ef4b5-eba1-706c-b6a0-e438b0a43410" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InsuranceCommissionsAndFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ef4b5-eba1-7ee8-a8be-52e0be931eef" xlink:to="loc_us-gaap_InsuranceCommissionsAndFees_019ef4b5-eba1-706c-b6a0-e438b0a43410" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019ef4b5-eba1-70da-851f-c4c157c02754" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ef4b5-eba1-7ee8-a8be-52e0be931eef" xlink:to="loc_us-gaap_NetInvestmentIncome_019ef4b5-eba1-70da-851f-c4c157c02754" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019ef4b5-eba1-76ee-8754-2953153fd4ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ef4b5-eba1-7ee8-a8be-52e0be931eef" xlink:to="loc_us-gaap_GainLossOnInvestments_019ef4b5-eba1-76ee-8754-2953153fd4ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncome_019ef4b5-eba1-7930-bcb5-ce43334a14aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ef4b5-eba1-7ee8-a8be-52e0be931eef" xlink:to="loc_us-gaap_OtherIncome_019ef4b5-eba1-7930-bcb5-ce43334a14aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019ef4b5-eba1-7cd7-872f-27b7d0a76687" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ef4b5-eba1-7ee8-a8be-52e0be931eef" xlink:to="loc_us-gaap_Revenues_019ef4b5-eba1-7cd7-872f-27b7d0a76687" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019ef4b5-eba1-70e8-ac8a-635f4eab3b3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BenefitsLossesAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:to="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019ef4b5-eba1-70e8-ac8a-635f4eab3b3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractBenefitsExpense_019ef4b5-eba1-7e6b-a857-5502d47e2bfc" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractBenefitsExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019ef4b5-eba1-70e8-ac8a-635f4eab3b3e" xlink:to="loc_ahl_InterestSensitiveContractBenefitsExpense_019ef4b5-eba1-7e6b-a857-5502d47e2bfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_019ef4b5-eba1-7b11-b680-0c81d2bf404b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019ef4b5-eba1-70e8-ac8a-635f4eab3b3e" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_019ef4b5-eba1-7b11-b680-0c81d2bf404b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitChangeInFairValueGainLoss_019ef4b5-eba1-7bc4-99b7-d5f91a3a68cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitChangeInFairValueGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019ef4b5-eba1-70e8-ac8a-635f4eab3b3e" xlink:to="loc_us-gaap_MarketRiskBenefitChangeInFairValueGainLoss_019ef4b5-eba1-7bc4-99b7-d5f91a3a68cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1_019ef4b5-eba1-7201-877f-29faa281c3eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019ef4b5-eba1-70e8-ac8a-635f4eab3b3e" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1_019ef4b5-eba1-7201-877f-29faa281c3eb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_019ef4b5-eba1-71d8-978d-18e4c6fe3dba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019ef4b5-eba1-70e8-ac8a-635f4eab3b3e" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_019ef4b5-eba1-71d8-978d-18e4c6fe3dba" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BenefitsLossesAndExpenses_019ef4b5-eba1-7cf7-95dc-910a18e3a9d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BenefitsLossesAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BenefitsLossesAndExpensesAbstract_019ef4b5-eba1-70e8-ac8a-635f4eab3b3e" xlink:to="loc_us-gaap_BenefitsLossesAndExpenses_019ef4b5-eba1-7cf7-95dc-910a18e3a9d5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019ef4b5-eba1-7bad-b648-6fb315c9f8bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019ef4b5-eba1-7bad-b648-6fb315c9f8bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019ef4b5-eba1-79b3-9b2d-ff0ab94cc6d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019ef4b5-eba1-79b3-9b2d-ff0ab94cc6d9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019ef4b5-eba1-771d-a09b-323b3aee858f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:to="loc_us-gaap_ProfitLoss_019ef4b5-eba1-771d-a09b-323b3aee858f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019ef4b5-eba1-7305-b24f-634ed3699de7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019ef4b5-eba1-7305-b24f-634ed3699de7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019ef4b5-eba1-7699-ab24-ab7c00f0f6b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:to="loc_us-gaap_NetIncomeLoss_019ef4b5-eba1-7699-ab24-ab7c00f0f6b4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019ef4b5-eba1-7cf2-b0ae-e2f5004f971b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019ef4b5-eba1-7cf2-b0ae-e2f5004f971b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019ef4b5-eba1-76c5-8629-b3ab9ebb094f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7019-9b01-f16594869fb8" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019ef4b5-eba1-76c5-8629-b3ab9ebb094f" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/CondensedConsolidatedStatementsofIncomeParenthetical" xlink:type="simple" xlink:href="ahl-20260630.xsd#CondensedConsolidatedStatementsofIncomeParenthetical"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/CondensedConsolidatedStatementsofIncomeParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7b55-96c6-c7754d9b1d29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019ef4b5-eba1-7722-a2ad-0249ffbe22da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7b55-96c6-c7754d9b1d29" xlink:to="loc_us-gaap_StatementTable_019ef4b5-eba1-7722-a2ad-0249ffbe22da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7756-8263-5f8ec493276c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ef4b5-eba1-7722-a2ad-0249ffbe22da" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7756-8263-5f8ec493276c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7756-8263-5f8ec493276c_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7756-8263-5f8ec493276c" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7756-8263-5f8ec493276c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7189-9b7e-e672e5e434f0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7756-8263-5f8ec493276c" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7189-9b7e-e672e5e434f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7435-925c-756ee5c3c69c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7189-9b7e-e672e5e434f0" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7435-925c-756ee5c3c69c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityAffiliatedEntityAndVIEPrimaryBeneficiaryMember_019ef4b5-eba1-7389-a066-60f39eaa9dd4" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityAffiliatedEntityAndVIEPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7189-9b7e-e672e5e434f0" xlink:to="loc_ahl_ConsolidatedEntityAffiliatedEntityAndVIEPrimaryBeneficiaryMember_019ef4b5-eba1-7389-a066-60f39eaa9dd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019ef4b5-eba1-75f9-9a06-59f2d6992933" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7b55-96c6-c7754d9b1d29" xlink:to="loc_us-gaap_NetInvestmentIncome_019ef4b5-eba1-75f9-9a06-59f2d6992933" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019ef4b5-eba1-75b8-b188-818618ecef05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7b55-96c6-c7754d9b1d29" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019ef4b5-eba1-75b8-b188-818618ecef05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019ef4b5-eba1-7773-8102-32b59cc17c74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7b55-96c6-c7754d9b1d29" xlink:to="loc_us-gaap_GainLossOnInvestments_019ef4b5-eba1-7773-8102-32b59cc17c74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractBenefitsExpense_019ef4b5-eba1-7cc2-ba67-1002084274a0" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractBenefitsExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7b55-96c6-c7754d9b1d29" xlink:to="loc_ahl_InterestSensitiveContractBenefitsExpense_019ef4b5-eba1-7cc2-ba67-1002084274a0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_019ef4b5-eba1-7b11-b012-67464513624c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7b55-96c6-c7754d9b1d29" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_019ef4b5-eba1-7b11-b012-67464513624c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/CondensedConsolidatedStatementsofEquity" xlink:type="simple" xlink:href="ahl-20260630.xsd#CondensedConsolidatedStatementsofEquity"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/CondensedConsolidatedStatementsofEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019ef4b5-eba1-716f-bc50-2e505bc0bf8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019ef4b5-eba1-7bb6-8314-40b7469cd364" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-716f-bc50-2e505bc0bf8e" xlink:to="loc_us-gaap_StatementTable_019ef4b5-eba1-7bb6-8314-40b7469cd364" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-eba1-7b24-85a2-ff8c7a99d45c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ef4b5-eba1-7bb6-8314-40b7469cd364" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-eba1-7b24-85a2-ff8c7a99d45c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019ef4b5-eba1-7b24-85a2-ff8c7a99d45c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-eba1-7b24-85a2-ff8c7a99d45c" xlink:to="loc_us-gaap_EquityComponentDomain_019ef4b5-eba1-7b24-85a2-ff8c7a99d45c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019ef4b5-eba1-7ab4-9edf-5ec251eed61a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-eba1-7b24-85a2-ff8c7a99d45c" xlink:to="loc_us-gaap_EquityComponentDomain_019ef4b5-eba1-7ab4-9edf-5ec251eed61a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_019ef4b5-eba1-7866-84ba-e12bdb8720d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-eba1-7ab4-9edf-5ec251eed61a" xlink:to="loc_us-gaap_ParentMember_019ef4b5-eba1-7866-84ba-e12bdb8720d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019ef4b5-eba1-7a46-8ca6-60ca18e7b3cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019ef4b5-eba1-7866-84ba-e12bdb8720d1" xlink:to="loc_us-gaap_PreferredStockMember_019ef4b5-eba1-7a46-8ca6-60ca18e7b3cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019ef4b5-eba1-7b0f-b2c5-5ee6e8189b59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019ef4b5-eba1-7866-84ba-e12bdb8720d1" xlink:to="loc_us-gaap_CommonStockMember_019ef4b5-eba1-7b0f-b2c5-5ee6e8189b59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019ef4b5-eba1-7380-bb61-74dfb81a7519" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019ef4b5-eba1-7866-84ba-e12bdb8720d1" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019ef4b5-eba1-7380-bb61-74dfb81a7519" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019ef4b5-eba1-7989-a1c8-416afe679e39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019ef4b5-eba1-7866-84ba-e12bdb8720d1" xlink:to="loc_us-gaap_RetainedEarningsMember_019ef4b5-eba1-7989-a1c8-416afe679e39" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019ef4b5-eba1-705d-b4d7-25d72b51a75f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019ef4b5-eba1-7866-84ba-e12bdb8720d1" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019ef4b5-eba1-705d-b4d7-25d72b51a75f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019ef4b5-eba1-76ca-b907-eb92fdbd36ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-eba1-7ab4-9edf-5ec251eed61a" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019ef4b5-eba1-76ca-b907-eb92fdbd36ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019ef4de-984e-7de1-bd3e-3b80c584914f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ef4b5-eba1-7bb6-8314-40b7469cd364" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019ef4de-984e-7de1-bd3e-3b80c584914f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ef4de-984e-7de1-bd3e-3b80c584914f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ef4de-984e-7de1-bd3e-3b80c584914f" xlink:to="loc_us-gaap_ClassOfStockDomain_019ef4de-984e-7de1-bd3e-3b80c584914f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ef4de-984e-78a8-9b2c-8d51cf2f3cda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ef4de-984e-7de1-bd3e-3b80c584914f" xlink:to="loc_us-gaap_ClassOfStockDomain_019ef4de-984e-78a8-9b2c-8d51cf2f3cda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesCPreferredStockMember_019ef4de-e11b-7579-8254-996fdc6610f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesCPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ef4de-984e-78a8-9b2c-8d51cf2f3cda" xlink:to="loc_us-gaap_SeriesCPreferredStockMember_019ef4de-e11b-7579-8254-996fdc6610f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019f435b-90d6-7ea4-9556-d90a0ce6f674" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ef4de-984e-78a8-9b2c-8d51cf2f3cda" xlink:to="loc_us-gaap_PreferredStockMember_019f435b-90d6-7ea4-9556-d90a0ce6f674" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019f43a3-b114-7650-845e-3cea2a3ab00e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ef4de-984e-78a8-9b2c-8d51cf2f3cda" xlink:to="loc_us-gaap_CommonStockMember_019f43a3-b114-7650-845e-3cea2a3ab00e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-716f-bc50-2e505bc0bf8e" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ef4b5-eba1-7c7d-8766-d9f693d0a8de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ef4b5-eba1-7c7d-8766-d9f693d0a8de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019ef4b5-eba1-79ed-91d8-6beb26b01464" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_ProfitLoss_019ef4b5-eba1-79ed-91d8-6beb26b01464" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019ef4b5-eba1-7ecb-a437-8532bb2532e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019ef4b5-eba1-7ecb-a437-8532bb2532e0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019ef4b5-eba1-74e9-8875-454b19cf8e6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019ef4b5-eba1-74e9-8875-454b19cf8e6c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockRedemptionDiscount_019ef4de-60de-740b-9931-c8cdcd9e7f6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockRedemptionDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_PreferredStockRedemptionDiscount_019ef4de-60de-740b-9931-c8cdcd9e7f6d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019ef4db-060c-711c-a0cb-350e09004270" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019ef4db-060c-711c-a0cb-350e09004270" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStock_019ef4b5-eba1-7bb6-bffc-d0b3abd06c72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_DividendsPreferredStock_019ef4b5-eba1-7bb6-bffc-d0b3abd06c72" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_019ef4b5-eba1-7066-ab37-1db75a6eefd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_DividendsCommonStock_019ef4b5-eba1-7066-ab37-1db75a6eefd6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOther_019ef4e2-f722-7ed4-9752-e56cddc42a27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_StockholdersEquityOther_019ef4e2-f722-7ed4-9752-e56cddc42a27" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_019ef4b5-eba1-722f-b2df-fd1ac007fee7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_019ef4b5-eba1-722f-b2df-fd1ac007fee7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_NoncontrollingInterestsIncreaseFromContributionsFromNoncontrollingInterests_019ef4b5-eba1-737d-9fa6-bc7fd83671e5" xlink:href="ahl-20260630.xsd#ahl_NoncontrollingInterestsIncreaseFromContributionsFromNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_ahl_NoncontrollingInterestsIncreaseFromContributionsFromNoncontrollingInterests_019ef4b5-eba1-737d-9fa6-bc7fd83671e5" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019ef4b5-eba1-7e93-ae69-d66a3b6a0642" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019ef4b5-eba1-7e93-ae69-d66a3b6a0642" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestPeriodIncreaseDecrease_019ef4b5-eba1-70b0-a0b1-cf50838c451c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ef4b5-eba1-7b1a-b7b4-d6bc5cd35c30" xlink:to="loc_us-gaap_MinorityInterestPeriodIncreaseDecrease_019ef4b5-eba1-70b0-a0b1-cf50838c451c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ef4b5-eba1-775c-b30d-7eab7d03fc6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="ahl-20260630.xsd#CondensedConsolidatedStatementsofCashFlows"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7d6a-aed9-01d1295fdbde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019ef4b5-eba1-72e2-b002-7d6285d9e664" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7d6a-aed9-01d1295fdbde" xlink:to="loc_us-gaap_StatementTable_019ef4b5-eba1-72e2-b002-7d6285d9e664" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7c95-ab6d-517fbae61107" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ef4b5-eba1-72e2-b002-7d6285d9e664" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7c95-ab6d-517fbae61107" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c95-ab6d-517fbae61107_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7c95-ab6d-517fbae61107" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c95-ab6d-517fbae61107_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7bae-bd2b-8fa9c3b01278" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7c95-ab6d-517fbae61107" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7bae-bd2b-8fa9c3b01278" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-eba1-7bec-8109-b5aa92a0c829" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7bae-bd2b-8fa9c3b01278" xlink:to="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-eba1-7bec-8109-b5aa92a0c829" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-770f-896f-7fd7d41eeba0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7bae-bd2b-8fa9c3b01278" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-770f-896f-7fd7d41eeba0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019fcf22-97f2-7646-87b4-77bcb46df0cf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7bae-bd2b-8fa9c3b01278" xlink:to="loc_srt_AffiliatedEntityMember_019fcf22-97f2-7646-87b4-77bcb46df0cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7931-8919-0399e66a7d98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7d6a-aed9-01d1295fdbde" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7931-8919-0399e66a7d98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019ef4b5-eba1-75af-a78f-ac751c504dc0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7931-8919-0399e66a7d98" xlink:to="loc_us-gaap_ProfitLoss_019ef4b5-eba1-75af-a78f-ac751c504dc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7893-977b-cc405c201552" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7931-8919-0399e66a7d98" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7893-977b-cc405c201552" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1_019ef4b5-eba1-7a43-a391-2e0d183aa16d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7893-977b-cc405c201552" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostsAndPresentValueOfFutureProfitsAmortization1_019ef4b5-eba1-7a43-a391-2e0d183aa16d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019ef4b5-eba1-71ba-b0c6-d5a6ac9ac637" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7893-977b-cc405c201552" xlink:to="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_019ef4b5-eba1-71ba-b0c6-d5a6ac9ac637" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_019ef4b5-eba1-74d0-aebe-6e5ddef64ad4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7893-977b-cc405c201552" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_019ef4b5-eba1-74d0-aebe-6e5ddef64ad4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_GainLossonInvestmentsandDerivatives_019ef4b5-eba1-7481-a878-a983fbb06de6" xlink:href="ahl-20260630.xsd#ahl_GainLossonInvestmentsandDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7893-977b-cc405c201552" xlink:to="loc_ahl_GainLossonInvestmentsandDerivatives_019ef4b5-eba1-7481-a878-a983fbb06de6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts_019ef4b5-eba1-786e-8c54-683aca08779a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7893-977b-cc405c201552" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredPolicyAcquisitionCosts_019ef4b5-eba1-786e-8c54-683aca08779a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019ef4b5-eba1-70b2-b0ad-7cff4fee93e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7893-977b-cc405c201552" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019ef4b5-eba1-70b2-b0ad-7cff4fee93e1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable_019ef4b5-eba1-782c-9790-45a1c938a193" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019ef4b5-eba1-70b2-b0ad-7cff4fee93e1" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable_019ef4b5-eba1-782c-9790-45a1c938a193" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_IncreaseDecreaseInInterestSensitiveContractLiabilities_019ef4b5-eba1-7b17-a505-7709a27d2a16" xlink:href="ahl-20260630.xsd#ahl_IncreaseDecreaseInInterestSensitiveContractLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019ef4b5-eba1-70b2-b0ad-7cff4fee93e1" xlink:to="loc_ahl_IncreaseDecreaseInInterestSensitiveContractLiabilities_019ef4b5-eba1-7b17-a505-7709a27d2a16" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInsuranceLiabilities_019ef4b5-eba1-7456-a357-e4ba04246fb3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInInsuranceLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019ef4b5-eba1-70b2-b0ad-7cff4fee93e1" xlink:to="loc_us-gaap_IncreaseDecreaseInInsuranceLiabilities_019ef4b5-eba1-7456-a357-e4ba04246fb3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements_019ef4b5-eba1-7846-a883-fc5f1212d4a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019ef4b5-eba1-70b2-b0ad-7cff4fee93e1" xlink:to="loc_us-gaap_IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements_019ef4b5-eba1-7846-a883-fc5f1212d4a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_019ef4b5-eba1-7302-a9cf-cdfaafd681f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019ef4b5-eba1-70b2-b0ad-7cff4fee93e1" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_019ef4b5-eba1-7302-a9cf-cdfaafd681f1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019ef4b5-eba1-7e78-a1c1-35a0e14fe3a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019ef4b5-eba1-7931-8919-0399e66a7d98" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019ef4b5-eba1-7e78-a1c1-35a0e14fe3a9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019ef4b5-eba1-75b7-91c6-b56278d46cdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7d6a-aed9-01d1295fdbde" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019ef4b5-eba1-75b7-91c6-b56278d46cdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7fbd-8e2c-22810a3eab95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019ef4b5-eba1-75b7-91c6-b56278d46cdb" xlink:to="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7fbd-8e2c-22810a3eab95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_019ef4b5-eba1-739c-8487-289bc4a82ecb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7fbd-8e2c-22810a3eab95" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_019ef4b5-eba1-739c-8487-289bc4a82ecb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment_019ef4b5-eba1-704f-bc34-63cdacf080e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7fbd-8e2c-22810a3eab95" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment_019ef4b5-eba1-704f-bc34-63cdacf080e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_Proceedsfromsaleofequitysecurities_019ef4b5-eba1-7594-8ec3-fc12a914ad21" xlink:href="ahl-20260630.xsd#ahl_Proceedsfromsaleofequitysecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7fbd-8e2c-22810a3eab95" xlink:to="loc_ahl_Proceedsfromsaleofequitysecurities_019ef4b5-eba1-7594-8ec3-fc12a914ad21" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable_019ef4b5-eba1-78c6-8a3a-63f9262f5bb8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7fbd-8e2c-22810a3eab95" xlink:to="loc_us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable_019ef4b5-eba1-78c6-8a3a-63f9262f5bb8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ProceedsfromInvestmentFunds_019ef4b5-eba1-7c9a-9551-f46a9b989be1" xlink:href="ahl-20260630.xsd#ahl_ProceedsfromInvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7fbd-8e2c-22810a3eab95" xlink:to="loc_ahl_ProceedsfromInvestmentFunds_019ef4b5-eba1-7c9a-9551-f46a9b989be1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_019ef4b5-eba1-71af-bb84-21d1e6423863" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7fbd-8e2c-22810a3eab95" xlink:to="loc_us-gaap_ProceedsFromDerivativeInstrumentInvestingActivities_019ef4b5-eba1-71af-bb84-21d1e6423863" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments_019ef4b5-eba1-766a-a886-05912ac02c71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7fbd-8e2c-22810a3eab95" xlink:to="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments_019ef4b5-eba1-766a-a886-05912ac02c71" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-748d-99af-4e0d1c1bb815" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireInvestmentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019ef4b5-eba1-75b7-91c6-b56278d46cdb" xlink:to="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-748d-99af-4e0d1c1bb815" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_019ef4b5-eba1-7861-8974-40f84d65cc46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-748d-99af-4e0d1c1bb815" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_019ef4b5-eba1-7861-8974-40f84d65cc46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment_019ef4b5-eba1-7da7-8fcf-611ae792af53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-748d-99af-4e0d1c1bb815" xlink:to="loc_us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment_019ef4b5-eba1-7da7-8fcf-611ae792af53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_Paymentstoacquireequitysecurities_019ef4b5-eba1-7018-b793-1880807cf0d2" xlink:href="ahl-20260630.xsd#ahl_Paymentstoacquireequitysecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-748d-99af-4e0d1c1bb815" xlink:to="loc_ahl_Paymentstoacquireequitysecurities_019ef4b5-eba1-7018-b793-1880807cf0d2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireMortgageNotesReceivable_019ef4b5-eba1-7e51-8c36-6673c1aa39ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireMortgageNotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-748d-99af-4e0d1c1bb815" xlink:to="loc_us-gaap_PaymentsToAcquireMortgageNotesReceivable_019ef4b5-eba1-7e51-8c36-6673c1aa39ab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PaymentstoAcquireInvestmentFunds_019ef4b5-eba1-7dd0-8951-be82c30350ac" xlink:href="ahl-20260630.xsd#ahl_PaymentstoAcquireInvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-748d-99af-4e0d1c1bb815" xlink:to="loc_ahl_PaymentstoAcquireInvestmentFunds_019ef4b5-eba1-7dd0-8951-be82c30350ac" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_019ef4b5-eba1-7118-8b53-27d0ac8a9e00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForDerivativeInstrumentInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-748d-99af-4e0d1c1bb815" xlink:to="loc_us-gaap_PaymentsForDerivativeInstrumentInvestingActivities_019ef4b5-eba1-7118-8b53-27d0ac8a9e00" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_019ef4b5-eba1-7213-ad4b-ca9c7b91f645" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-748d-99af-4e0d1c1bb815" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_019ef4b5-eba1-7213-ad4b-ca9c7b91f645" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019ef4b5-eba1-78ce-9723-78aafc453608" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019ef4b5-eba1-75b7-91c6-b56278d46cdb" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019ef4b5-eba1-78ce-9723-78aafc453608" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019ef4b5-eba1-778c-b586-839e8bed597b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019ef4b5-eba1-75b7-91c6-b56278d46cdb" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019ef4b5-eba1-778c-b586-839e8bed597b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7d6a-aed9-01d1295fdbde" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromAnnuitiesAndInvestmentCertificates_019ef4b5-eba1-7a8a-88e3-2e792110bade" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromAnnuitiesAndInvestmentCertificates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_ProceedsFromAnnuitiesAndInvestmentCertificates_019ef4b5-eba1-7a8a-88e3-2e792110bade" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfAnnuitiesAndInvestmentCertificates_019ef4b5-eba1-7c78-9889-2cd3f5d674b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfAnnuitiesAndInvestmentCertificates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_RepaymentsOfAnnuitiesAndInvestmentCertificates_019ef4b5-eba1-7c78-9889-2cd3f5d674b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_019faa1f-9f21-75b8-b947-c785a8274eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_019faa1f-9f21-75b8-b947-c785a8274eb4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromContributionsFromParent_019faa20-78e8-77dc-9a66-6cfae488f287" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromContributionsFromParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_ProceedsFromContributionsFromParent_019faa20-78e8-77dc-9a66-6cfae488f287" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_019ef4b5-eba1-740c-9624-30529bb10ace" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_019ef4b5-eba1-740c-9624-30529bb10ace" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_019ef4b5-eba1-7dd1-a98d-9799ec13572b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_019ef4b5-eba1-7dd1-a98d-9799ec13572b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromDerivativeInstrumentFinancingActivities_019ef4b5-eba1-7445-8a4f-64a5db462076" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForProceedsFromDerivativeInstrumentFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_PaymentsForProceedsFromDerivativeInstrumentFinancingActivities_019ef4b5-eba1-7445-8a4f-64a5db462076" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019ef4b5-eba1-7773-8f04-57c36fa4db2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_019ef4b5-eba1-7773-8f04-57c36fa4db2f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_019ef4b5-eba1-77cd-9cb5-473a03c7d74e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_019ef4b5-eba1-77cd-9cb5-473a03c7d74e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock_019f435b-0937-74ad-9dfd-312fe876e53f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock_019f435b-0937-74ad-9dfd-312fe876e53f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019ef4b5-eba1-71b9-b677-9d47566bc05c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019ef4b5-eba1-71b9-b677-9d47566bc05c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019ef4b5-eba1-7f9e-8f08-a41503474b29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019ef4b5-eba1-79f4-ba9f-2485346117cf" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019ef4b5-eba1-7f9e-8f08-a41503474b29" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019ef4b5-eba1-72fc-9c11-85bef31bc3f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7d6a-aed9-01d1295fdbde" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019ef4b5-eba1-72fc-9c11-85bef31bc3f3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019ef4b5-eba1-7a10-8653-ddcff2c3a33c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7d6a-aed9-01d1295fdbde" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019ef4b5-eba1-7a10-8653-ddcff2c3a33c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019ef4b5-eba1-7faa-9094-ef93848d4818" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7d6a-aed9-01d1295fdbde" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019ef4b5-eba1-7faa-9094-ef93848d4818" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019ef4b5-eba1-78fc-ab16-0381f600270b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_019ef4b5-eba1-72df-9269-2110f51d7afb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7d6a-aed9-01d1295fdbde" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_019ef4b5-eba1-72df-9269-2110f51d7afb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_019ef4b5-eba1-7c25-b430-4f802978046e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019ef4b5-eba1-72df-9269-2110f51d7afb" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_019ef4b5-eba1-7c25-b430-4f802978046e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_019ef4b5-eba1-7568-ac6d-ca8351db89ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncashInvestingAndFinancingItemsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019ef4b5-eba1-72df-9269-2110f51d7afb" xlink:to="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_019ef4b5-eba1-7568-ac6d-ca8351db89ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts_019ef4b5-eba1-7d65-a47f-0d2b8244d9f8" xlink:href="ahl-20260630.xsd#ahl_ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_019ef4b5-eba1-7568-ac6d-ca8351db89ba" xlink:to="loc_ahl_ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts_019ef4b5-eba1-7d65-a47f-0d2b8244d9f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts_019ef4b5-eba1-7ac1-831b-f2881dbc3480" xlink:href="ahl-20260630.xsd#ahl_ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_019ef4b5-eba1-7568-ac6d-ca8351db89ba" xlink:to="loc_ahl_ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts_019ef4b5-eba1-7ac1-831b-f2881dbc3480" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferToInvestments_019faf65-2de7-7725-bb47-e1d2d683adc1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransferToInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashInvestingAndFinancingItemsAbstract_019ef4b5-eba1-7568-ac6d-ca8351db89ba" xlink:to="loc_us-gaap_TransferToInvestments_019faf65-2de7-7725-bb47-e1d2d683adc1" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/CondensedConsolidatedStatementsofCashFlowsParenthetical" xlink:type="simple" xlink:href="ahl-20260630.xsd#CondensedConsolidatedStatementsofCashFlowsParenthetical"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/CondensedConsolidatedStatementsofCashFlowsParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019ef4b5-eba1-7bc5-85a0-a08dc8e3b3ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:to="loc_us-gaap_StatementTable_019ef4b5-eba1-7bc5-85a0-a08dc8e3b3ed" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7987-9159-b5d4d7cabe9c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ef4b5-eba1-7bc5-85a0-a08dc8e3b3ed" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7987-9159-b5d4d7cabe9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7987-9159-b5d4d7cabe9c_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7987-9159-b5d4d7cabe9c" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7987-9159-b5d4d7cabe9c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7699-a812-0212e3ced650" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7987-9159-b5d4d7cabe9c" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7699-a812-0212e3ced650" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7f0a-8784-251a92bdff76" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7699-a812-0212e3ced650" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7f0a-8784-251a92bdff76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_019ef4b5-eba1-75fc-8604-178dc89b60eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions_019ef4b5-eba1-75fc-8604-178dc89b60eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_GainLossonInvestmentsandDerivatives_019ef4b5-eba1-73ec-beb0-648ff403bf42" xlink:href="ahl-20260630.xsd#ahl_GainLossonInvestmentsandDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:to="loc_ahl_GainLossonInvestmentsandDerivatives_019ef4b5-eba1-73ec-beb0-648ff403bf42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInsuranceLiabilities_019ef4b5-eba1-72c6-a344-8e457cb44665" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInInsuranceLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:to="loc_us-gaap_IncreaseDecreaseInInsuranceLiabilities_019ef4b5-eba1-72c6-a344-8e457cb44665" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements_019ef4b5-eba1-7807-aa45-ecf0dbdecc4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:to="loc_us-gaap_IncreaseDecreaseInFundsHeldUnderReinsuranceAgreements_019ef4b5-eba1-7807-aa45-ecf0dbdecc4e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7271-a239-ea3d6e1c4b60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:to="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7271-a239-ea3d6e1c4b60" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_019ef4b5-eba1-79c0-bb1b-52c4a7a0b94b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7271-a239-ea3d6e1c4b60" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_019ef4b5-eba1-79c0-bb1b-52c4a7a0b94b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment_019ef4b5-eba1-7f59-9bed-aa4012a59abe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7271-a239-ea3d6e1c4b60" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfTradingSecuritiesHeldforinvestment_019ef4b5-eba1-7f59-9bed-aa4012a59abe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable_019fcf0c-1bfb-7a2f-883e-1f945cf93a52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7271-a239-ea3d6e1c4b60" xlink:to="loc_us-gaap_ProceedsFromSaleAndCollectionOfMortgageNotesReceivable_019fcf0c-1bfb-7a2f-883e-1f945cf93a52" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ProceedsfromInvestmentFunds_019ef4b5-eba1-7464-a17b-ee4758dd7822" xlink:href="ahl-20260630.xsd#ahl_ProceedsfromInvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7271-a239-ea3d6e1c4b60" xlink:to="loc_ahl_ProceedsfromInvestmentFunds_019ef4b5-eba1-7464-a17b-ee4758dd7822" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments_019ef4b5-eba1-77ca-9b2d-4f495703294f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestmentsAbstract_019ef4b5-eba1-7271-a239-ea3d6e1c4b60" xlink:to="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionOfShorttermInvestments_019ef4b5-eba1-77ca-9b2d-4f495703294f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-7ee5-80c6-6729e5c9495e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireInvestmentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:to="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-7ee5-80c6-6729e5c9495e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_019ef4b5-eba1-7395-9968-12d9d41e4849" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-7ee5-80c6-6729e5c9495e" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_019ef4b5-eba1-7395-9968-12d9d41e4849" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment_019ef4b5-eba1-715d-86cb-b35811c04a1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-7ee5-80c6-6729e5c9495e" xlink:to="loc_us-gaap_PaymentsToAcquireTradingSecuritiesHeldforinvestment_019ef4b5-eba1-715d-86cb-b35811c04a1c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireMortgageNotesReceivable_019ef4b5-eba1-7dac-8369-d36526649f66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireMortgageNotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-7ee5-80c6-6729e5c9495e" xlink:to="loc_us-gaap_PaymentsToAcquireMortgageNotesReceivable_019ef4b5-eba1-7dac-8369-d36526649f66" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PaymentstoAcquireInvestmentFunds_019ef4b5-eba1-70d4-8dcd-455c764c96b0" xlink:href="ahl-20260630.xsd#ahl_PaymentstoAcquireInvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-7ee5-80c6-6729e5c9495e" xlink:to="loc_ahl_PaymentstoAcquireInvestmentFunds_019ef4b5-eba1-70d4-8dcd-455c764c96b0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_019ef4b5-eba1-7fad-a281-31dd0dfaaf80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PaymentsToAcquireInvestmentsAbstract_019ef4b5-eba1-7ee5-80c6-6729e5c9495e" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_019ef4b5-eba1-7fad-a281-31dd0dfaaf80" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfAnnuitiesAndInvestmentCertificates_019ef4b5-eba1-7632-9431-c8074a15a8f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfAnnuitiesAndInvestmentCertificates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:to="loc_us-gaap_RepaymentsOfAnnuitiesAndInvestmentCertificates_019ef4b5-eba1-7632-9431-c8074a15a8f5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts_019ef4b5-eba1-7ed9-8850-31efb32dd8ce" xlink:href="ahl-20260630.xsd#ahl_ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:to="loc_ahl_ReinsuranceAgreementsDepositsonInvestmentPoliciesandContracts_019ef4b5-eba1-7ed9-8850-31efb32dd8ce" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts_019ef4b5-eba1-7cc4-8125-3fb8cc6987a2" xlink:href="ahl-20260630.xsd#ahl_ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ef4b5-eba1-7140-a57a-feeb44fa004d" xlink:to="loc_ahl_ReinsuranceAgreementsWithdrawalsonInvestmentPoliciesandContracts_019ef4b5-eba1-7cc4-8125-3fb8cc6987a2" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsScheduleofAFSSecuritiesDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsScheduleofAFSSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsScheduleofAFSSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7f6b-a291-d43ec12572e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019ef4b5-eba1-7462-ae91-219c3d98fd7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7f6b-a291-d43ec12572e5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019ef4b5-eba1-7462-ae91-219c3d98fd7f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7691-af2d-05be2f2d8a6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019ef4b5-eba1-7462-ae91-219c3d98fd7f" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7691-af2d-05be2f2d8a6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7691-af2d-05be2f2d8a6e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7691-af2d-05be2f2d8a6e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7691-af2d-05be2f2d8a6e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-73d8-a864-21a035dde0f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7691-af2d-05be2f2d8a6e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-73d8-a864-21a035dde0f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019ef4b5-eba1-775c-a6f0-91450f6f8598" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-73d8-a864-21a035dde0f3" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019ef4b5-eba1-775c-a6f0-91450f6f8598" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-eba1-7060-bdeb-f8fc915d5b0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-73d8-a864-21a035dde0f3" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-eba1-7060-bdeb-f8fc915d5b0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-eba1-762e-967c-ed26bc642885" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-73d8-a864-21a035dde0f3" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-eba1-762e-967c-ed26bc642885" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-eba1-7be8-b686-73b19736d634" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-73d8-a864-21a035dde0f3" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-eba1-7be8-b686-73b19736d634" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-eba1-7e3e-96aa-bdf6633d8b7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-73d8-a864-21a035dde0f3" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-eba1-7e3e-96aa-bdf6633d8b7e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-eba1-70bb-b95d-3f2daf8126ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-73d8-a864-21a035dde0f3" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-eba1-70bb-b95d-3f2daf8126ca" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-eba1-7137-b01e-ae097900f047" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-73d8-a864-21a035dde0f3" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-eba1-7137-b01e-ae097900f047" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-eba1-7108-b19d-8b1996ac2631" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-73d8-a864-21a035dde0f3" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-eba1-7108-b19d-8b1996ac2631" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7204-8d59-151d3c56c128" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019ef4b5-eba1-7462-ae91-219c3d98fd7f" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7204-8d59-151d3c56c128" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7204-8d59-151d3c56c128_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7204-8d59-151d3c56c128" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7204-8d59-151d3c56c128_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7a6d-a3e6-3c8b305ded46" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7204-8d59-151d3c56c128" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7a6d-a3e6-3c8b305ded46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-74a1-85f0-26f8c3069c5a" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7a6d-a3e6-3c8b305ded46" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-74a1-85f0-26f8c3069c5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-712f-866c-086e9027ebc0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7a6d-a3e6-3c8b305ded46" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-712f-866c-086e9027ebc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7976-89bd-22381974e90d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019ef4b5-eba1-7462-ae91-219c3d98fd7f" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7976-89bd-22381974e90d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-7976-89bd-22381974e90d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7976-89bd-22381974e90d" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-7976-89bd-22381974e90d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-760d-8181-d6eb48f7cae6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7976-89bd-22381974e90d" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-760d-8181-d6eb48f7cae6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7899-98c5-a7eff2de9964" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-760d-8181-d6eb48f7cae6" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7899-98c5-a7eff2de9964" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019ef4b5-eba1-7f16-877e-622f482409f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7f6b-a291-d43ec12572e5" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019ef4b5-eba1-7f16-877e-622f482409f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019ef4b5-eba1-7663-afa7-4d39b6340d97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7f6b-a291-d43ec12572e5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019ef4b5-eba1-7663-afa7-4d39b6340d97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded_019ef56d-018f-7be6-aafb-c5573a685d19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7f6b-a291-d43ec12572e5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded_019ef56d-018f-7be6-aafb-c5573a685d19" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal_019ef533-e5ed-7daf-99c9-68b8d7edd4e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7f6b-a291-d43ec12572e5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal_019ef533-e5ed-7daf-99c9-68b8d7edd4e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold_019ef56e-5dc1-7da0-9e65-a30a5513ec05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7f6b-a291-d43ec12572e5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold_019ef56e-5dc1-7da0-9e65-a30a5513ec05" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019ef4b5-eba1-75b8-bcc1-8a4d46248884" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7f6b-a291-d43ec12572e5" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019ef4b5-eba1-75b8-bcc1-8a4d46248884" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019ef4b5-eba1-7a43-9cdc-d5513e6ae0ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7f6b-a291-d43ec12572e5" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019ef4b5-eba1-7a43-9cdc-d5513e6ae0ca" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-eba1-78d2-931b-319b0b8767b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7f6b-a291-d43ec12572e5" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-eba1-78d2-931b-319b0b8767b7" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsMaturitiesofAFSSecuritiesDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsMaturitiesofAFSSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsMaturitiesofAFSSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7275-84f7-d2fb257086a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019ef4b5-eba1-7140-a5c5-e830f6f60d2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7275-84f7-d2fb257086a1" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019ef4b5-eba1-7140-a5c5-e830f6f60d2c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7b70-9b66-20f4c9bf8a27" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019ef4b5-eba1-7140-a5c5-e830f6f60d2c" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7b70-9b66-20f4c9bf8a27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7b70-9b66-20f4c9bf8a27_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7b70-9b66-20f4c9bf8a27" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7b70-9b66-20f4c9bf8a27_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c02-b829-6c839514f3ae" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7b70-9b66-20f4c9bf8a27" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c02-b829-6c839514f3ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-7f26-b6e1-c2087188fd4b" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c02-b829-6c839514f3ae" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-7f26-b6e1-c2087188fd4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-75a6-8545-f600f2229917" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c02-b829-6c839514f3ae" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-75a6-8545-f600f2229917" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostBasisRollingMaturityAbstract_019ef4b5-eba1-76c2-8213-1dd13b06a394" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostBasisRollingMaturityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7275-84f7-d2fb257086a1" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostBasisRollingMaturityAbstract_019ef4b5-eba1-76c2-8213-1dd13b06a394" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_019ef4b5-eba1-7e15-ac2d-3877c005fcf4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostBasisRollingMaturityAbstract_019ef4b5-eba1-76c2-8213-1dd13b06a394" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis_019ef4b5-eba1-7e15-ac2d-3877c005fcf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_019ef4b5-eba1-78a4-aaca-6c2b0bc4aa72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostBasisRollingMaturityAbstract_019ef4b5-eba1-76c2-8213-1dd13b06a394" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis_019ef4b5-eba1-78a4-aaca-6c2b0bc4aa72" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis_019ef4b5-eba1-7e60-b79f-0a68911e579d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostBasisRollingMaturityAbstract_019ef4b5-eba1-76c2-8213-1dd13b06a394" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis_019ef4b5-eba1-7e60-b79f-0a68911e579d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_019ef4b5-eba1-7c24-a39d-1901b2e43b70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostBasisRollingMaturityAbstract_019ef4b5-eba1-76c2-8213-1dd13b06a394" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis_019ef4b5-eba1-7c24-a39d-1901b2e43b70" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019ef4b5-eba1-76bc-9163-33a98d2d0beb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostBasisRollingMaturityAbstract_019ef4b5-eba1-76c2-8213-1dd13b06a394" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019ef4b5-eba1-76bc-9163-33a98d2d0beb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019ef4b5-eba1-745d-9c9a-9b1c9d37d576" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostBasisRollingMaturityAbstract_019ef4b5-eba1-76c2-8213-1dd13b06a394" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_019ef4b5-eba1-745d-9c9a-9b1c9d37d576" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueRollingMaturityAbstract_019ef4b5-eba1-74e3-a13f-32a7a704d0d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueRollingMaturityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-7275-84f7-d2fb257086a1" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueRollingMaturityAbstract_019ef4b5-eba1-74e3-a13f-32a7a704d0d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_019ef4b5-eba1-721d-b103-938290c3bc1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueRollingMaturityAbstract_019ef4b5-eba1-74e3-a13f-32a7a704d0d9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue_019ef4b5-eba1-721d-b103-938290c3bc1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_019ef4b5-eba1-751b-8a64-b156b88af395" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueRollingMaturityAbstract_019ef4b5-eba1-74e3-a13f-32a7a704d0d9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue_019ef4b5-eba1-751b-8a64-b156b88af395" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_019ef4b5-eba1-7731-8fa2-5c1193bf50da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueRollingMaturityAbstract_019ef4b5-eba1-74e3-a13f-32a7a704d0d9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue_019ef4b5-eba1-7731-8fa2-5c1193bf50da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue_019ef4b5-eba1-7c00-a95a-bfb7ad1838f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueRollingMaturityAbstract_019ef4b5-eba1-74e3-a13f-32a7a704d0d9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue_019ef4b5-eba1-7c00-a95a-bfb7ad1838f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019ef4b5-eba1-7e5f-9b61-9f2b7cb07bd9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueRollingMaturityAbstract_019ef4b5-eba1-74e3-a13f-32a7a704d0d9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019ef4b5-eba1-7e5f-9b61-9f2b7cb07bd9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-eba1-7f3e-989b-69ea5a914527" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueRollingMaturityAbstract_019ef4b5-eba1-74e3-a13f-32a7a704d0d9" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-eba1-7f3e-989b-69ea5a914527" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsUnrealizedLossesonAFSSecuritiesDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsUnrealizedLossesonAFSSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsUnrealizedLossesonAFSSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-75c1-ade5-c7ba3169bce0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_019ef4b5-eba1-76e1-8788-1fb08abcc13f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-75c1-ade5-c7ba3169bce0" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_019ef4b5-eba1-76e1-8788-1fb08abcc13f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7bfc-ac60-d3a6c17ba160" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_019ef4b5-eba1-76e1-8788-1fb08abcc13f" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7bfc-ac60-d3a6c17ba160" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7bfc-ac60-d3a6c17ba160_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7bfc-ac60-d3a6c17ba160" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7bfc-ac60-d3a6c17ba160_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7bfc-ac60-d3a6c17ba160" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019ef4b5-eba1-7fb3-b955-187f5ac587d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019ef4b5-eba1-7fb3-b955-187f5ac587d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-eba1-714b-aa06-8636949af02e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-eba1-714b-aa06-8636949af02e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-eba1-7753-9b5a-14009f4a9329" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-eba1-7753-9b5a-14009f4a9329" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-eba1-74fd-8300-97ff5e92f33f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-eba1-74fd-8300-97ff5e92f33f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-eba1-7b9b-8b38-c217a1a432bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-eba1-7b9b-8b38-c217a1a432bd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-eba1-7448-9e88-0888b7f58f92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-eba1-7448-9e88-0888b7f58f92" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-eba1-7dd1-b58d-4ac3e20b0291" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-eba1-7dd1-b58d-4ac3e20b0291" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-eba1-7253-916d-5fb9d48342be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-eba1-7253-916d-5fb9d48342be" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019ef4b5-eba1-74d4-94b2-f7a1dcae8120" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:to="loc_us-gaap_DebtSecuritiesMember_019ef4b5-eba1-74d4-94b2-f7a1dcae8120" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019ef4b5-eba1-7451-97ab-69f1a86c8a29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-741a-aee3-b72d8a5e874d" xlink:to="loc_us-gaap_EquitySecuritiesMember_019ef4b5-eba1-7451-97ab-69f1a86c8a29" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-75bc-90cb-875ea1bb3780" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_019ef4b5-eba1-76e1-8788-1fb08abcc13f" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-75bc-90cb-875ea1bb3780" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-75bc-90cb-875ea1bb3780_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-75bc-90cb-875ea1bb3780" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-75bc-90cb-875ea1bb3780_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7162-9ff0-54e5ba6a05c8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-75bc-90cb-875ea1bb3780" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7162-9ff0-54e5ba6a05c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-7449-9178-8713a03819c5" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7162-9ff0-54e5ba6a05c8" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-7449-9178-8713a03819c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7e23-8926-f6e41b95a741" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7162-9ff0-54e5ba6a05c8" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7e23-8926-f6e41b95a741" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019ef4b5-eba1-757c-8388-f54e101d2617" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-75c1-ade5-c7ba3169bce0" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019ef4b5-eba1-757c-8388-f54e101d2617" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019ef4b5-eba1-7471-885d-f51355df5e8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-75c1-ade5-c7ba3169bce0" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019ef4b5-eba1-7471-885d-f51355df5e8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019ef4b5-eba1-7d31-9121-28e44992e3f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-75c1-ade5-c7ba3169bce0" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019ef4b5-eba1-7d31-9121-28e44992e3f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019ef4b5-eba1-72fb-b437-ef242415f6ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-75c1-ade5-c7ba3169bce0" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019ef4b5-eba1-72fb-b437-ef242415f6ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019ef4b5-eba1-7bfe-811a-aacde3579832" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-75c1-ade5-c7ba3169bce0" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019ef4b5-eba1-7bfe-811a-aacde3579832" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019ef4b5-eba1-7826-8250-ca86ebd61bff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-75c1-ade5-c7ba3169bce0" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019ef4b5-eba1-7826-8250-ca86ebd61bff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_019ef4b5-eba1-7de7-8be5-27ca3f2de744" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-75c1-ade5-c7ba3169bce0" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_019ef4b5-eba1-7de7-8be5-27ca3f2de744" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_019ef4b5-eba1-7658-9c83-6d85d3623619" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019ef4b5-eba1-75c1-ade5-c7ba3169bce0" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_019ef4b5-eba1-7658-9c83-6d85d3623619" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsAllowanceforCreditLossesRollforwardDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsAllowanceforCreditLossesRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsAllowanceforCreditLossesRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems_019ef4b5-eba1-78e7-b15b-f5b5dad22d09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019ef4b5-eba1-75b9-a628-bf36d8700d1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems_019ef4b5-eba1-78e7-b15b-f5b5dad22d09" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019ef4b5-eba1-75b9-a628-bf36d8700d1b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7572-a2f4-0c658f563f2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019ef4b5-eba1-75b9-a628-bf36d8700d1b" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7572-a2f4-0c658f563f2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7572-a2f4-0c658f563f2e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7572-a2f4-0c658f563f2e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7572-a2f4-0c658f563f2e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-712a-95c3-e19d4d8cd997" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7572-a2f4-0c658f563f2e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-712a-95c3-e19d4d8cd997" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-eba1-765a-ad49-eca957880bd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-712a-95c3-e19d4d8cd997" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-eba1-765a-ad49-eca957880bd6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-eba1-77c4-a6c4-df2f23753500" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-712a-95c3-e19d4d8cd997" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-eba1-77c4-a6c4-df2f23753500" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-eba1-7ce0-98ab-246299bc0702" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-712a-95c3-e19d4d8cd997" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-eba1-7ce0-98ab-246299bc0702" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-eba1-76d1-87a0-2ba17fe6efd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-712a-95c3-e19d4d8cd997" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-eba1-76d1-87a0-2ba17fe6efd4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_019ef564-47a7-7a27-9587-3b7ef20fcd22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-712a-95c3-e19d4d8cd997" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_019ef564-47a7-7a27-9587-3b7ef20fcd22" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-703a-a12a-0dab220762fd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019ef4b5-eba1-75b9-a628-bf36d8700d1b" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-703a-a12a-0dab220762fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-703a-a12a-0dab220762fd_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-703a-a12a-0dab220762fd" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-703a-a12a-0dab220762fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7131-b40b-36c0420e5c82" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-703a-a12a-0dab220762fd" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7131-b40b-36c0420e5c82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-71e4-89f5-986ef94e45f0" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7131-b40b-36c0420e5c82" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-71e4-89f5-986ef94e45f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7e15-ac2b-f507a8c3b833" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7131-b40b-36c0420e5c82" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7e15-ac2b-f507a8c3b833" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019ef4b5-eba1-77ba-be55-062e60d1e8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems_019ef4b5-eba1-78e7-b15b-f5b5dad22d09" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019ef4b5-eba1-77ba-be55-062e60d1e8a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019ef4b5-eba1-7f46-8221-e7782c0dbb3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019ef4b5-eba1-77ba-be55-062e60d1e8a7" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019ef4b5-eba1-7f46-8221-e7782c0dbb3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded_019ef4b5-eba1-7915-acda-d43c57cb7515" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019ef4b5-eba1-77ba-be55-062e60d1e8a7" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded_019ef4b5-eba1-7915-acda-d43c57cb7515" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold_019ef4b5-eba1-7ea2-959e-ff6db8316d0c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019ef4b5-eba1-77ba-be55-062e60d1e8a7" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold_019ef4b5-eba1-7ea2-959e-ff6db8316d0c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal_019ef4b5-eba1-7764-a0be-cef3d7156da3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019ef4b5-eba1-77ba-be55-062e60d1e8a7" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal_019ef4b5-eba1-7764-a0be-cef3d7156da3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_019ef4b5-eba1-77a8-85c3-237efc6b2b8d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsNetInvestmentIncomeDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsNetInvestmentIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsNetInvestmentIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019ef4b5-eba1-7a6c-a48c-ac228d23f51b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019ef4b5-eba1-7ace-a90e-e6be67eeaf54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019ef4b5-eba1-7a6c-a48c-ac228d23f51b" xlink:to="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019ef4b5-eba1-7ace-a90e-e6be67eeaf54" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-763c-8b41-f67050cb9b8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019ef4b5-eba1-7ace-a90e-e6be67eeaf54" xlink:to="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-763c-8b41-f67050cb9b8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-763c-8b41-f67050cb9b8f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-763c-8b41-f67050cb9b8f" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-763c-8b41-f67050cb9b8f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7de8-887f-d8c54522688d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-763c-8b41-f67050cb9b8f" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7de8-887f-d8c54522688d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019ef4b5-eba1-7008-b612-53c6f48c4196" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7de8-887f-d8c54522688d" xlink:to="loc_us-gaap_DebtSecuritiesMember_019ef4b5-eba1-7008-b612-53c6f48c4196" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-eba1-73a1-8d16-f30e79b1a47d" xlink:href="ahl-20260630.xsd#ahl_DebtSecuritiesTradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7de8-887f-d8c54522688d" xlink:to="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-eba1-73a1-8d16-f30e79b1a47d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019ef4b5-eba1-7ccb-ab78-d7dc4d7d1729" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7de8-887f-d8c54522688d" xlink:to="loc_us-gaap_EquitySecuritiesMember_019ef4b5-eba1-7ccb-ab78-d7dc4d7d1729" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_019ef4b5-eba1-724a-8514-9eb8407dbcf1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7de8-887f-d8c54522688d" xlink:to="loc_us-gaap_MortgagesMember_019ef4b5-eba1-724a-8514-9eb8407dbcf1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-eba1-7fd7-8cb6-5c07ca9fa39e" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7de8-887f-d8c54522688d" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-eba1-7fd7-8cb6-5c07ca9fa39e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundsWithheldatInterestMember_019ef4b5-eba1-785f-97f8-b215cd68edf9" xlink:href="ahl-20260630.xsd#ahl_FundsWithheldatInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7de8-887f-d8c54522688d" xlink:to="loc_ahl_FundsWithheldatInterestMember_019ef4b5-eba1-785f-97f8-b215cd68edf9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentsOtherMember_019ef5d1-d9c9-766f-8cff-f385422a093d" xlink:href="ahl-20260630.xsd#ahl_InvestmentsOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7de8-887f-d8c54522688d" xlink:to="loc_ahl_InvestmentsOtherMember_019ef5d1-d9c9-766f-8cff-f385422a093d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-79a3-ba39-fa7daf3bd28d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_019ef4b5-eba1-7ace-a90e-e6be67eeaf54" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-79a3-ba39-fa7daf3bd28d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-79a3-ba39-fa7daf3bd28d_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-79a3-ba39-fa7daf3bd28d" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-79a3-ba39-fa7daf3bd28d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7b2b-8812-310f784fd362" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-79a3-ba39-fa7daf3bd28d" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7b2b-8812-310f784fd362" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-eba1-7e39-8b84-195d33bdf5dd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7b2b-8812-310f784fd362" xlink:to="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-eba1-7e39-8b84-195d33bdf5dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossInvestmentIncomeOperating_019ef4b5-eba1-7e7d-af1f-f1e7f9af4202" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019ef4b5-eba1-7a6c-a48c-ac228d23f51b" xlink:to="loc_us-gaap_GrossInvestmentIncomeOperating_019ef4b5-eba1-7e7d-af1f-f1e7f9af4202" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsGainLoss_019ef4b5-eba1-7477-bdff-5d6d949bde9f" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019ef4b5-eba1-7a6c-a48c-ac228d23f51b" xlink:to="loc_ahl_InvestmentFundsGainLoss_019ef4b5-eba1-7477-bdff-5d6d949bde9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019ef4b5-eba1-7021-a801-281b55b65b20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019ef4b5-eba1-7a6c-a48c-ac228d23f51b" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019ef4b5-eba1-7021-a801-281b55b65b20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019ef4b5-eba1-7b8f-9e8a-6ca71be7d52d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_019ef4b5-eba1-7a6c-a48c-ac228d23f51b" xlink:to="loc_us-gaap_NetInvestmentIncome_019ef4b5-eba1-7b8f-9e8a-6ca71be7d52d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsInvestmentRelatedGainsLossesDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsInvestmentRelatedGainsLossesDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsInvestmentRelatedGainsLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019ef4b5-eba1-7852-9fdd-535fa2817c49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019ef4b5-eba1-7852-9fdd-535fa2817c49" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7bdf-901b-44508c63d8ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019ef4b5-eba1-7852-9fdd-535fa2817c49" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7bdf-901b-44508c63d8ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7bdf-901b-44508c63d8ce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7bdf-901b-44508c63d8ce" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7bdf-901b-44508c63d8ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7228-b8e0-9d37ddad5f86" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-7bdf-901b-44508c63d8ce" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7228-b8e0-9d37ddad5f86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019ef4b5-eba1-7fd0-9444-fb825f8ab56e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7228-b8e0-9d37ddad5f86" xlink:to="loc_us-gaap_LoansReceivableMember_019ef4b5-eba1-7fd0-9444-fb825f8ab56e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-79c6-9c62-c0f8686c4e87" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019ef4b5-eba1-7852-9fdd-535fa2817c49" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-79c6-9c62-c0f8686c4e87" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-79c6-9c62-c0f8686c4e87_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-79c6-9c62-c0f8686c4e87" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-79c6-9c62-c0f8686c4e87_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7076-8219-c8e1129f6bfb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-79c6-9c62-c0f8686c4e87" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7076-8219-c8e1129f6bfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-eba1-7356-b465-0e121a01ed98" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7076-8219-c8e1129f6bfb" xlink:to="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-eba1-7356-b465-0e121a01ed98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_019ef4b5-eba1-7081-8b5a-f5432f063c82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_019ef4b5-eba1-7081-8b5a-f5432f063c82" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_019ef4b5-eba1-7a14-8ca6-0741e6b74bf9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_019ef4b5-eba1-7a14-8ca6-0741e6b74bf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_019ef4b5-eba1-768c-a883-dd5aec433056" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_019ef4b5-eba1-768c-a883-dd5aec433056" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingGainLoss_019ef4b5-eba1-76b1-b9a9-961453a52db8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesTradingGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:to="loc_us-gaap_DebtSecuritiesTradingGainLoss_019ef4b5-eba1-76b1-b9a9-961453a52db8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiGainLoss_019ef4b5-eba1-7e94-b75a-c37616fad4a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNiGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:to="loc_us-gaap_EquitySecuritiesFvNiGainLoss_019ef4b5-eba1-7e94-b75a-c37616fad4a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019ef4b5-eba1-7be6-b23b-d1dc6bc2df2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:to="loc_us-gaap_GainLossOnInvestments_019ef4b5-eba1-7be6-b23b-d1dc6bc2df2d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019ef4b5-eba1-787a-b25f-373247c80a3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019ef4b5-eba1-787a-b25f-373247c80a3f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_019ef4b5-eba1-75a5-b552-378e5f74a3f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProvisionForLoanLeaseAndOtherLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:to="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_019ef4b5-eba1-75a5-b552-378e5f74a3f7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherInvestments_019ef4b5-eba1-7705-bc02-96e1a696af2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfOtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-7b02-9f91-8535947e7cb5" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherInvestments_019ef4b5-eba1-7705-bc02-96e1a696af2e" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsUnrealizedgainslossesrecognizedinincomeDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsUnrealizedgainslossesrecognizedinincomeDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsUnrealizedgainslossesrecognizedinincomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-75f6-adf5-754a7546ebc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019ef4b5-eba1-7c7a-8c15-a9533bb4efa5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-75f6-adf5-754a7546ebc2" xlink:to="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019ef4b5-eba1-7c7a-8c15-a9533bb4efa5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-78e2-8afc-039061f595cb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsTable_019ef4b5-eba1-7c7a-8c15-a9533bb4efa5" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-78e2-8afc-039061f595cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-78e2-8afc-039061f595cb_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-78e2-8afc-039061f595cb" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-78e2-8afc-039061f595cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-725d-a2c4-ec91199614f0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-78e2-8afc-039061f595cb" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-725d-a2c4-ec91199614f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-77bf-8bee-c145ebefdfe0" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-725d-a2c4-ec91199614f0" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-77bf-8bee-c145ebefdfe0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-763f-a5c8-b95b43834210" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-725d-a2c4-ec91199614f0" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-763f-a5c8-b95b43834210" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingUnrealizedGainLoss_019ef4b5-eba1-794c-8124-b5933aa082a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesTradingUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-75f6-adf5-754a7546ebc2" xlink:to="loc_us-gaap_DebtSecuritiesTradingUnrealizedGainLoss_019ef4b5-eba1-794c-8124-b5933aa082a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_019ef4b5-eba1-7697-8fbc-c8fa31dafadd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_019ef4b5-eba1-75f6-adf5-754a7546ebc2" xlink:to="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss_019ef4b5-eba1-7697-8fbc-c8fa31dafadd" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsRepurchaseAgreementsDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsRepurchaseAgreementsDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsRepurchaseAgreementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ScheduleofRepurchaseAgreementsLineItems_019ef4b5-eba1-78eb-97fe-8e12cc5f2fab" xlink:href="ahl-20260630.xsd#ahl_ScheduleofRepurchaseAgreementsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ScheduleofRepurchaseAgreementsTable_019ef4b5-eba1-7266-9164-4f493bc2556b" xlink:href="ahl-20260630.xsd#ahl_ScheduleofRepurchaseAgreementsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ahl_ScheduleofRepurchaseAgreementsLineItems_019ef4b5-eba1-78eb-97fe-8e12cc5f2fab" xlink:to="loc_ahl_ScheduleofRepurchaseAgreementsTable_019ef4b5-eba1-7266-9164-4f493bc2556b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-79dc-aa08-f3fdd6f5d455" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahl_ScheduleofRepurchaseAgreementsTable_019ef4b5-eba1-7266-9164-4f493bc2556b" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-79dc-aa08-f3fdd6f5d455" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-79dc-aa08-f3fdd6f5d455_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-79dc-aa08-f3fdd6f5d455" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-79dc-aa08-f3fdd6f5d455_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-79dc-aa08-f3fdd6f5d455" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019ef4b5-eba1-7c5d-8322-a5962d1e3005" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019ef4b5-eba1-7c5d-8322-a5962d1e3005" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-eba1-7319-a1a3-257ce7805847" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-eba1-7319-a1a3-257ce7805847" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-eba1-7d0f-9f51-64325e083d5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-eba1-7d0f-9f51-64325e083d5d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019ef4b5-eba1-7c9b-a673-61c9fea53ae5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019ef4b5-eba1-7c9b-a673-61c9fea53ae5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-eba1-773d-9438-579d671bc09f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-eba1-773d-9438-579d671bc09f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-eba1-7879-85ac-49e3b0858224" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-eba1-7879-85ac-49e3b0858224" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-eba1-703a-8192-c54b035ba219" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-eba1-703a-8192-c54b035ba219" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019f4355-4ba6-7a2a-903b-8c5da8812768" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019f4355-4ba6-7a2a-903b-8c5da8812768" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019f4356-deab-75d3-8049-29e565f0bf6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-75ca-8e3d-68d2c97f6515" xlink:to="loc_us-gaap_EquitySecuritiesMember_019f4356-deab-75d3-8049-29e565f0bf6b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis_019ef4b5-eba1-7095-81e1-86926e0cf3d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahl_ScheduleofRepurchaseAgreementsTable_019ef4b5-eba1-7266-9164-4f493bc2556b" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis_019ef4b5-eba1-7095-81e1-86926e0cf3d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019ef4b5-eba1-7095-81e1-86926e0cf3d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis_019ef4b5-eba1-7095-81e1-86926e0cf3d2" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019ef4b5-eba1-7095-81e1-86926e0cf3d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019ef4b5-eba1-7ac0-9a2d-b35040e6ce90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis_019ef4b5-eba1-7095-81e1-86926e0cf3d2" xlink:to="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019ef4b5-eba1-7ac0-9a2d-b35040e6ce90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaturityUpTo30DaysMember_019ef4b5-eba1-7b99-ade3-569fee09a2f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MaturityUpTo30DaysMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019ef4b5-eba1-7ac0-9a2d-b35040e6ce90" xlink:to="loc_us-gaap_MaturityUpTo30DaysMember_019ef4b5-eba1-7b99-ade3-569fee09a2f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_A91DaysTo1YearMember_019ef4b5-eba1-7f71-bf9d-9b750ff2aea4" xlink:href="ahl-20260630.xsd#ahl_A91DaysTo1YearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019ef4b5-eba1-7ac0-9a2d-b35040e6ce90" xlink:to="loc_ahl_A91DaysTo1YearMember_019ef4b5-eba1-7f71-bf9d-9b750ff2aea4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_MaturityGreaterthan1YearMember_019ef4b5-eba1-76be-8c1d-c0861395abf3" xlink:href="ahl-20260630.xsd#ahl_MaturityGreaterthan1YearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodDomain_019ef4b5-eba1-7ac0-9a2d-b35040e6ce90" xlink:to="loc_ahl_MaturityGreaterthan1YearMember_019ef4b5-eba1-76be-8c1d-c0861395abf3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtRepurchaseAgreements_019ef4b5-eba1-7654-882e-7d29749a135d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtRepurchaseAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_ScheduleofRepurchaseAgreementsLineItems_019ef4b5-eba1-78eb-97fe-8e12cc5f2fab" xlink:to="loc_us-gaap_SecuredDebtRepurchaseAgreements_019ef4b5-eba1-7654-882e-7d29749a135d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesforRepurchaseAgreementsAmortizedCost_019ef4b5-eba1-786c-ab05-41f827b5baf4" xlink:href="ahl-20260630.xsd#ahl_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesforRepurchaseAgreementsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_ScheduleofRepurchaseAgreementsLineItems_019ef4b5-eba1-78eb-97fe-8e12cc5f2fab" xlink:to="loc_ahl_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesforRepurchaseAgreementsAmortizedCost_019ef4b5-eba1-786c-ab05-41f827b5baf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreementsFairValue_019ef4b5-eba1-7ecd-a381-a457e2561877" xlink:href="ahl-20260630.xsd#ahl_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreementsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_ScheduleofRepurchaseAgreementsLineItems_019ef4b5-eba1-78eb-97fe-8e12cc5f2fab" xlink:to="loc_ahl_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreementsFairValue_019ef4b5-eba1-7ecd-a381-a457e2561877" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_RepurchaseAgreementsNetOfReverseRepurchaseAgreements_019ef4b5-eba1-7ecc-8646-40832ab93612" xlink:href="ahl-20260630.xsd#ahl_RepurchaseAgreementsNetOfReverseRepurchaseAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_ScheduleofRepurchaseAgreementsLineItems_019ef4b5-eba1-78eb-97fe-8e12cc5f2fab" xlink:to="loc_ahl_RepurchaseAgreementsNetOfReverseRepurchaseAgreements_019ef4b5-eba1-7ecc-8646-40832ab93612" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsMortgageLoansNetDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsMortgageLoansNetDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsMortgageLoansNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-7a03-b2be-431968c85cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansAndLeasesReceivableDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-716f-a475-f2b36a9bb288" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansAndLeasesReceivableDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-7a03-b2be-431968c85cdc" xlink:to="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-716f-a475-f2b36a9bb288" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-7376-9807-fead73bfb2e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-716f-a475-f2b36a9bb288" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-7376-9807-fead73bfb2e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7376-9807-fead73bfb2e0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-7376-9807-fead73bfb2e0" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7376-9807-fead73bfb2e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7291-ad48-f699fa46b963" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-7376-9807-fead73bfb2e0" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7291-ad48-f699fa46b963" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_019ef4b5-eba1-7550-b1b5-fe19d28b512d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7291-ad48-f699fa46b963" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_019ef4b5-eba1-7550-b1b5-fe19d28b512d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_019ef4b5-eba1-7f9b-9abd-359acc866be2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7291-ad48-f699fa46b963" xlink:to="loc_us-gaap_ResidentialMortgageMember_019ef4b5-eba1-7f9b-9abd-359acc866be2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019ef4b5-eba1-72c6-9a93-695e8b2a69b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-716f-a475-f2b36a9bb288" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019ef4b5-eba1-72c6-9a93-695e8b2a69b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ef4b5-eba1-72c6-9a93-695e8b2a69b1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019ef4b5-eba1-72c6-9a93-695e8b2a69b1" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ef4b5-eba1-72c6-9a93-695e8b2a69b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ef4b5-eba1-7523-9c58-4d3a5833ae13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019ef4b5-eba1-72c6-9a93-695e8b2a69b1" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ef4b5-eba1-7523-9c58-4d3a5833ae13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_CommercialMortgageLoansExcludingLoansUnderDevelopmentMember_019ef4b5-eba1-7059-9c09-50d92c72c9c8" xlink:href="ahl-20260630.xsd#ahl_CommercialMortgageLoansExcludingLoansUnderDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ef4b5-eba1-7523-9c58-4d3a5833ae13" xlink:to="loc_ahl_CommercialMortgageLoansExcludingLoansUnderDevelopmentMember_019ef4b5-eba1-7059-9c09-50d92c72c9c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_CommercialMortgageLoansUnderDevelopmentMember_019ef4b5-eba1-7b20-aeef-2d920177f698" xlink:href="ahl-20260630.xsd#ahl_CommercialMortgageLoansUnderDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ef4b5-eba1-7523-9c58-4d3a5833ae13" xlink:to="loc_ahl_CommercialMortgageLoansUnderDevelopmentMember_019ef4b5-eba1-7b20-aeef-2d920177f698" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedBalancePrincipalAmount_019ef4b5-eba1-7d7b-ae42-1c8469137686" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedBalancePrincipalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-7a03-b2be-431968c85cdc" xlink:to="loc_us-gaap_InvestmentOwnedBalancePrincipalAmount_019ef4b5-eba1-7d7b-ae42-1c8469137686" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables_019ef4b5-eba1-78bc-9e82-d0f8e2912747" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-7a03-b2be-431968c85cdc" xlink:to="loc_us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables_019ef4b5-eba1-78bc-9e82-d0f8e2912747" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-eba1-7edd-8244-f52483a84499" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-7a03-b2be-431968c85cdc" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-eba1-7edd-8244-f52483a84499" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_MortgageLoans_019ef4b5-eba1-71ef-babc-b36f0f6de33e" xlink:href="ahl-20260630.xsd#ahl_MortgageLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-7a03-b2be-431968c85cdc" xlink:to="loc_ahl_MortgageLoans_019ef4b5-eba1-71ef-babc-b36f0f6de33e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsMortgageLoansNetbyPropertyTypeandGeographicRegionDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsMortgageLoansNetbyPropertyTypeandGeographicRegionDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsMortgageLoansNetbyPropertyTypeandGeographicRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-70bc-9a24-73ce0cb0063e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansAndLeasesReceivableDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-7900-ae1a-3057fc503864" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansAndLeasesReceivableDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-70bc-9a24-73ce0cb0063e" xlink:to="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-7900-ae1a-3057fc503864" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-75ff-9b80-f3314fedd73e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-7900-ae1a-3057fc503864" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-75ff-9b80-f3314fedd73e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-75ff-9b80-f3314fedd73e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-75ff-9b80-f3314fedd73e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-75ff-9b80-f3314fedd73e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7ef8-a35b-dcc8cc5677c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-75ff-9b80-f3314fedd73e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7ef8-a35b-dcc8cc5677c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_019ef4b5-eba1-7722-ba2b-0cd4fc40dac8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7ef8-a35b-dcc8cc5677c0" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_019ef4b5-eba1-7722-ba2b-0cd4fc40dac8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019ef4b5-eba1-7453-8f77-769d6ef7004d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-7900-ae1a-3057fc503864" xlink:to="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019ef4b5-eba1-7453-8f77-769d6ef7004d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019ef4b5-eba1-7453-8f77-769d6ef7004d_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019ef4b5-eba1-7453-8f77-769d6ef7004d" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019ef4b5-eba1-7453-8f77-769d6ef7004d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019ef4b5-eba1-73c6-964c-076bd17220d6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019ef4b5-eba1-7453-8f77-769d6ef7004d" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019ef4b5-eba1-73c6-964c-076bd17220d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_HotelMember_019ef4b5-eba1-71b2-bcfa-ea994cee5047" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_HotelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019ef4b5-eba1-73c6-964c-076bd17220d6" xlink:to="loc_srt_HotelMember_019ef4b5-eba1-71b2-bcfa-ea994cee5047" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RetailSiteMember_019ef4b5-eba1-71e8-a6e6-6bf144706b17" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RetailSiteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019ef4b5-eba1-73c6-964c-076bd17220d6" xlink:to="loc_srt_RetailSiteMember_019ef4b5-eba1-71e8-a6e6-6bf144706b17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OfficeBuildingMember_019ef4b5-eba1-74e0-95a4-4a7b5a78ae5a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OfficeBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019ef4b5-eba1-73c6-964c-076bd17220d6" xlink:to="loc_srt_OfficeBuildingMember_019ef4b5-eba1-74e0-95a4-4a7b5a78ae5a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_IndustrialPropertyMember_019ef4b5-eba1-7574-9c25-0521c4fd969e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_IndustrialPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019ef4b5-eba1-73c6-964c-076bd17220d6" xlink:to="loc_srt_IndustrialPropertyMember_019ef4b5-eba1-7574-9c25-0521c4fd969e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ApartmentBuildingMember_019ef4b5-eba1-7943-837a-6b112d622b3d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ApartmentBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019ef4b5-eba1-73c6-964c-076bd17220d6" xlink:to="loc_srt_ApartmentBuildingMember_019ef4b5-eba1-7943-837a-6b112d622b3d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OtherPropertyMember_019ef4b5-eba1-7a40-a36a-d7a9cc73458b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OtherPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019ef4b5-eba1-73c6-964c-076bd17220d6" xlink:to="loc_srt_OtherPropertyMember_019ef4b5-eba1-7a40-a36a-d7a9cc73458b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019ef4b5-eba1-75dd-b3bc-893262e75489" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-7900-ae1a-3057fc503864" xlink:to="loc_srt_StatementGeographicalAxis_019ef4b5-eba1-75dd-b3bc-893262e75489" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-75dd-b3bc-893262e75489_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019ef4b5-eba1-75dd-b3bc-893262e75489" xlink:to="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-75dd-b3bc-893262e75489_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7a66-8578-c74b5d215557" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019ef4b5-eba1-75dd-b3bc-893262e75489" xlink:to="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7a66-8578-c74b5d215557" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7a66-8578-c74b5d215557" xlink:to="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_U.SEastNorthCentralMember_019ef4b5-eba1-712a-9106-c164737bdb3c" xlink:href="ahl-20260630.xsd#ahl_U.SEastNorthCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_ahl_U.SEastNorthCentralMember_019ef4b5-eba1-712a-9106-c164737bdb3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_U.S.EastSouthCentralMember_019ef4b5-eba1-7b8c-851a-628fee789e23" xlink:href="ahl-20260630.xsd#ahl_U.S.EastSouthCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_ahl_U.S.EastSouthCentralMember_019ef4b5-eba1-7b8c-851a-628fee789e23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_U.S.MiddleAtlanticMember_019ef4b5-eba1-76a5-a2e1-17738d296156" xlink:href="ahl-20260630.xsd#ahl_U.S.MiddleAtlanticMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_ahl_U.S.MiddleAtlanticMember_019ef4b5-eba1-76a5-a2e1-17738d296156" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_U.S.MountainMember_019ef4b5-eba1-76f4-9cbf-3f08a53dfbe9" xlink:href="ahl-20260630.xsd#ahl_U.S.MountainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_ahl_U.S.MountainMember_019ef4b5-eba1-76f4-9cbf-3f08a53dfbe9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_U.S.NewEnglandMember_019ef4b5-eba1-791c-8724-7121cd9ec2b7" xlink:href="ahl-20260630.xsd#ahl_U.S.NewEnglandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_ahl_U.S.NewEnglandMember_019ef4b5-eba1-791c-8724-7121cd9ec2b7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_U.S.PacificMember_019ef4b5-eba1-778e-b5ea-f772893fb1b7" xlink:href="ahl-20260630.xsd#ahl_U.S.PacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_ahl_U.S.PacificMember_019ef4b5-eba1-778e-b5ea-f772893fb1b7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_U.S.SouthAtlanticMember_019ef4b5-eba1-78cc-a4b9-ba42c95bd52f" xlink:href="ahl-20260630.xsd#ahl_U.S.SouthAtlanticMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_ahl_U.S.SouthAtlanticMember_019ef4b5-eba1-78cc-a4b9-ba42c95bd52f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_U.S.WestNorthCentralMember_019ef4b5-eba1-7cd8-9efd-a2d11b06f31d" xlink:href="ahl-20260630.xsd#ahl_U.S.WestNorthCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_ahl_U.S.WestNorthCentralMember_019ef4b5-eba1-7cd8-9efd-a2d11b06f31d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_U.S.WestSouthCentralMember_019ef4b5-eba1-7772-b9f6-aed5bf12a822" xlink:href="ahl-20260630.xsd#ahl_U.S.WestSouthCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_ahl_U.S.WestSouthCentralMember_019ef4b5-eba1-7772-b9f6-aed5bf12a822" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_CA_019ef4b5-eba1-7257-b682-2702667322e8" xlink:href="https://xbrl.sec.gov/stpr/2026/stpr-2026.xsd#stpr_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_stpr_CA_019ef4b5-eba1-7257-b682-2702667322e8" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_FL_019ef4b5-eba1-7e42-abef-8c1c1a3ed4f0" xlink:href="https://xbrl.sec.gov/stpr/2026/stpr-2026.xsd#stpr_FL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_stpr_FL_019ef4b5-eba1-7e42-abef-8c1c1a3ed4f0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherU.S.StatesMember_019ef4b5-eba1-700e-a125-9042893a6540" xlink:href="ahl-20260630.xsd#ahl_OtherU.S.StatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_country_US_019ef4b5-eba1-71bd-ace2-026f0f2c3601" xlink:to="loc_ahl_OtherU.S.StatesMember_019ef4b5-eba1-700e-a125-9042893a6540" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_019ef4b5-eba1-7657-aa64-1165ec68fcce" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7a66-8578-c74b5d215557" xlink:to="loc_country_GB_019ef4b5-eba1-7657-aa64-1165ec68fcce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InternationalOtherMember_019ef4b5-eba1-73f3-8b59-7412f1b01da9" xlink:href="ahl-20260630.xsd#ahl_InternationalOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7a66-8578-c74b5d215557" xlink:to="loc_ahl_InternationalOtherMember_019ef4b5-eba1-73f3-8b59-7412f1b01da9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InternationalMember_019ef4b5-eba1-733d-bebf-71393b6aec0e" xlink:href="ahl-20260630.xsd#ahl_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7a66-8578-c74b5d215557" xlink:to="loc_ahl_InternationalMember_019ef4b5-eba1-733d-bebf-71393b6aec0e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019ef4b5-eba1-7fdd-b854-31c90b38e788" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-7900-ae1a-3057fc503864" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019ef4b5-eba1-7fdd-b854-31c90b38e788" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-7fdd-b854-31c90b38e788_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019ef4b5-eba1-7fdd-b854-31c90b38e788" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-7fdd-b854-31c90b38e788_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-7acd-abd9-cb51fed8ec1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019ef4b5-eba1-7fdd-b854-31c90b38e788" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-7acd-abd9-cb51fed8ec1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PropertyTypeConcentrationRiskMember_019ef4b5-eba1-78b1-b29b-2a7b5be594f5" xlink:href="ahl-20260630.xsd#ahl_PropertyTypeConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-7acd-abd9-cb51fed8ec1b" xlink:to="loc_ahl_PropertyTypeConcentrationRiskMember_019ef4b5-eba1-78b1-b29b-2a7b5be594f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_019ef4b5-eba1-74f6-abe6-56e00824668c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-7acd-abd9-cb51fed8ec1b" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_019ef4b5-eba1-74f6-abe6-56e00824668c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-75cf-9e10-a8e36f56d663" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-7900-ae1a-3057fc503864" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-75cf-9e10-a8e36f56d663" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-75cf-9e10-a8e36f56d663_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-75cf-9e10-a8e36f56d663" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-75cf-9e10-a8e36f56d663_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-7c60-8ca1-de46eda60ce9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-75cf-9e10-a8e36f56d663" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-7c60-8ca1-de46eda60ce9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_MortgageLoansNetMember_019ef4b5-eba1-7785-88a6-aa5820d1c9b9" xlink:href="ahl-20260630.xsd#ahl_MortgageLoansNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-7c60-8ca1-de46eda60ce9" xlink:to="loc_ahl_MortgageLoansNetMember_019ef4b5-eba1-7785-88a6-aa5820d1c9b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-eba1-7ff9-a805-80c3294e0e39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-70bc-9a24-73ce0cb0063e" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-eba1-7ff9-a805-80c3294e0e39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019ef4b5-eba1-763e-b3ac-85a454e2cda5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-70bc-9a24-73ce0cb0063e" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019ef4b5-eba1-763e-b3ac-85a454e2cda5" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsMortgageLoansResidentialbyStateDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsMortgageLoansResidentialbyStateDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsMortgageLoansResidentialbyStateDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-7ee2-bca8-1626ea8bc4dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansAndLeasesReceivableDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-70be-9772-7c77d9d8f9f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansAndLeasesReceivableDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-7ee2-bca8-1626ea8bc4dc" xlink:to="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-70be-9772-7c77d9d8f9f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019ef4b5-eba1-7094-88b9-0ad643228600" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-70be-9772-7c77d9d8f9f8" xlink:to="loc_srt_StatementGeographicalAxis_019ef4b5-eba1-7094-88b9-0ad643228600" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7094-88b9-0ad643228600_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019ef4b5-eba1-7094-88b9-0ad643228600" xlink:to="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7094-88b9-0ad643228600_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7981-b82b-f6444e1bf669" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019ef4b5-eba1-7094-88b9-0ad643228600" xlink:to="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7981-b82b-f6444e1bf669" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_CA_019ef4b5-eba1-71b4-a091-ef0c4e509dc9" xlink:href="https://xbrl.sec.gov/stpr/2026/stpr-2026.xsd#stpr_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7981-b82b-f6444e1bf669" xlink:to="loc_stpr_CA_019ef4b5-eba1-71b4-a091-ef0c4e509dc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_FL_019ef4b5-eba1-7698-a441-01ddb898f317" xlink:href="https://xbrl.sec.gov/stpr/2026/stpr-2026.xsd#stpr_FL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7981-b82b-f6444e1bf669" xlink:to="loc_stpr_FL_019ef4b5-eba1-7698-a441-01ddb898f317" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_TX_019ef4b5-eba1-7046-95a2-7d62313d5a82" xlink:href="https://xbrl.sec.gov/stpr/2026/stpr-2026.xsd#stpr_TX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7981-b82b-f6444e1bf669" xlink:to="loc_stpr_TX_019ef4b5-eba1-7046-95a2-7d62313d5a82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherU.S.StatesMember_019ef4b5-eba1-7b3c-8639-16ffe998027f" xlink:href="ahl-20260630.xsd#ahl_OtherU.S.StatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7981-b82b-f6444e1bf669" xlink:to="loc_ahl_OtherU.S.StatesMember_019ef4b5-eba1-7b3c-8639-16ffe998027f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019ef4b5-eba1-716a-87f0-515f9ce8c97f" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7981-b82b-f6444e1bf669" xlink:to="loc_country_US_019ef4b5-eba1-716a-87f0-515f9ce8c97f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_019ef4b5-eba1-713d-a6ed-1f39321d574a" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7981-b82b-f6444e1bf669" xlink:to="loc_country_GB_019ef4b5-eba1-713d-a6ed-1f39321d574a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InternationalOtherMember_019ef4b5-eba1-79c5-a94c-6f3285aa01b3" xlink:href="ahl-20260630.xsd#ahl_InternationalOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7981-b82b-f6444e1bf669" xlink:to="loc_ahl_InternationalOtherMember_019ef4b5-eba1-79c5-a94c-6f3285aa01b3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InternationalMember_019ef4b5-eba1-7075-a109-9dbc0ad44b4f" xlink:href="ahl-20260630.xsd#ahl_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019ef4b5-eba1-7981-b82b-f6444e1bf669" xlink:to="loc_ahl_InternationalMember_019ef4b5-eba1-7075-a109-9dbc0ad44b4f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019ef4b5-eba1-77b0-9de8-ef1cb88c3f73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-70be-9772-7c77d9d8f9f8" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019ef4b5-eba1-77b0-9de8-ef1cb88c3f73" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-77b0-9de8-ef1cb88c3f73_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019ef4b5-eba1-77b0-9de8-ef1cb88c3f73" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-77b0-9de8-ef1cb88c3f73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-75a4-86d9-a9c0a2ba6acf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019ef4b5-eba1-77b0-9de8-ef1cb88c3f73" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-75a4-86d9-a9c0a2ba6acf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_019ef4b5-eba1-7b12-8d58-7fc90653a82b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019ef4b5-eba1-75a4-86d9-a9c0a2ba6acf" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_019ef4b5-eba1-7b12-8d58-7fc90653a82b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-7ab4-af73-f5d05d34341e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-70be-9772-7c77d9d8f9f8" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-7ab4-af73-f5d05d34341e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7ab4-af73-f5d05d34341e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-7ab4-af73-f5d05d34341e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7ab4-af73-f5d05d34341e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7435-90e4-703ba00d0e3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ef4b5-eba1-7ab4-af73-f5d05d34341e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7435-90e4-703ba00d0e3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_019ef4b5-eba1-722b-bd56-6d735a4b8efe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ef4b5-eba1-7435-90e4-703ba00d0e3e" xlink:to="loc_us-gaap_ResidentialMortgageMember_019ef4b5-eba1-722b-bd56-6d735a4b8efe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-760d-8522-5b120316d1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureTable_019ef4b5-eba1-70be-9772-7c77d9d8f9f8" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-760d-8522-5b120316d1e7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-760d-8522-5b120316d1e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-760d-8522-5b120316d1e7" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-760d-8522-5b120316d1e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-793d-bf6e-09467324fe87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-760d-8522-5b120316d1e7" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-793d-bf6e-09467324fe87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_MortgageLoansNetMember_019ef4b5-eba1-757e-9756-655c502d64a1" xlink:href="ahl-20260630.xsd#ahl_MortgageLoansNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-793d-bf6e-09467324fe87" xlink:to="loc_ahl_MortgageLoansNetMember_019ef4b5-eba1-757e-9756-655c502d64a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019ef4b5-eba1-7a6a-ab2d-715b623ac7be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansAndLeasesReceivableDisclosureLineItems_019ef4b5-eba1-7ee2-bca8-1626ea8bc4dc" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019ef4b5-eba1-7a6a-ab2d-715b623ac7be" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsInvestmentFundsDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsInvestmentFundsDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsInvestmentFundsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019ef4b5-eba1-7ab8-bc34-6a5d1781e059" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019ef4b5-eba1-7f6c-83e3-adfe782e1fe0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019ef4b5-eba1-7ab8-bc34-6a5d1781e059" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019ef4b5-eba1-7f6c-83e3-adfe782e1fe0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7fa9-96c4-0df5dbbbb02e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019ef4b5-eba1-7f6c-83e3-adfe782e1fe0" xlink:to="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7fa9-96c4-0df5dbbbb02e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7fa9-96c4-0df5dbbbb02e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7fa9-96c4-0df5dbbbb02e" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7fa9-96c4-0df5dbbbb02e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-717b-a3ac-2819903adf33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7fa9-96c4-0df5dbbbb02e" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-717b-a3ac-2819903adf33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityFundsMember_019ef4b5-eba1-7a90-b0c5-43389826c95f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-717b-a3ac-2819903adf33" xlink:to="loc_us-gaap_EquityFundsMember_019ef4b5-eba1-7a90-b0c5-43389826c95f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OriginationPlatformsMember_019ef4b5-eba1-7c58-9ecc-a963ffff2947" xlink:href="ahl-20260630.xsd#ahl_OriginationPlatformsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-717b-a3ac-2819903adf33" xlink:to="loc_ahl_OriginationPlatformsMember_019ef4b5-eba1-7c58-9ecc-a963ffff2947" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InsurancePlatformsMember_019ef4b5-eba1-789a-b0e7-65f148e46c06" xlink:href="ahl-20260630.xsd#ahl_InsurancePlatformsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-717b-a3ac-2819903adf33" xlink:to="loc_ahl_InsurancePlatformsMember_019ef4b5-eba1-789a-b0e7-65f148e46c06" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_CreditFundsMember_019ef4b5-eba1-7ac7-97f8-2440bc534a73" xlink:href="ahl-20260630.xsd#ahl_CreditFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-717b-a3ac-2819903adf33" xlink:to="loc_ahl_CreditFundsMember_019ef4b5-eba1-7ac7-97f8-2440bc534a73" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherFundsMember_019ef4b5-eba1-7723-a4a3-4f687bfffbfe" xlink:href="ahl-20260630.xsd#ahl_OtherFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-717b-a3ac-2819903adf33" xlink:to="loc_ahl_OtherFundsMember_019ef4b5-eba1-7723-a4a3-4f687bfffbfe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7a8b-9206-598df413a634" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019ef4b5-eba1-7f6c-83e3-adfe782e1fe0" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7a8b-9206-598df413a634" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-7a8b-9206-598df413a634_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7a8b-9206-598df413a634" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-7a8b-9206-598df413a634_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-7b50-aef0-afa086346185" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7a8b-9206-598df413a634" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-7b50-aef0-afa086346185" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-77d4-94dc-45bfe72c6295" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-7b50-aef0-afa086346185" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-77d4-94dc-45bfe72c6295" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-71ad-ba8b-e121b8057633" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_019ef4b5-eba1-7f6c-83e3-adfe782e1fe0" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-71ad-ba8b-e121b8057633" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-71ad-ba8b-e121b8057633_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-71ad-ba8b-e121b8057633" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-71ad-ba8b-e121b8057633_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-711d-bcda-b9c59471c24c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-71ad-ba8b-e121b8057633" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-711d-bcda-b9c59471c24c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-7316-ab9f-010429e4895c" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-711d-bcda-b9c59471c24c" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-7316-ab9f-010429e4895c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-79a2-ad45-cf7a968b100c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-711d-bcda-b9c59471c24c" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-79a2-ad45-cf7a968b100c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-778a-86b4-ff7da671e99f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-711d-bcda-b9c59471c24c" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-778a-86b4-ff7da671e99f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFunds_019ef4b5-eba1-7ba6-bd04-9082d39f8ab5" xlink:href="ahl-20260630.xsd#ahl_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019ef4b5-eba1-7ab8-bc34-6a5d1781e059" xlink:to="loc_ahl_InvestmentFunds_019ef4b5-eba1-7ba6-bd04-9082d39f8ab5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_CarryingAmountAssetsPercentofTotal_019ef4b5-eba1-78e1-b9b2-38c31739dd94" xlink:href="ahl-20260630.xsd#ahl_CarryingAmountAssetsPercentofTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_019ef4b5-eba1-7ab8-bc34-6a5d1781e059" xlink:to="loc_ahl_CarryingAmountAssetsPercentofTotal_019ef4b5-eba1-78e1-b9b2-38c31739dd94" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsSummaryofMaximumLossExposureDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsSummaryofMaximumLossExposureDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsSummaryofMaximumLossExposureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7f71-8c6f-ccb0e53c83cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7eba-8a33-605c95282f81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7f71-8c6f-ccb0e53c83cf" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7eba-8a33-605c95282f81" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7ddd-b844-c04cac398c14" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7eba-8a33-605c95282f81" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7ddd-b844-c04cac398c14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7ddd-b844-c04cac398c14_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7ddd-b844-c04cac398c14" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7ddd-b844-c04cac398c14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c6d-b714-3cf55eca50c5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7ddd-b844-c04cac398c14" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c6d-b714-3cf55eca50c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-734a-aa9a-ee3ac07ce50f" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c6d-b714-3cf55eca50c5" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-eba1-734a-aa9a-ee3ac07ce50f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7e6d-953c-d91144877581" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c6d-b714-3cf55eca50c5" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7e6d-953c-d91144877581" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-7790-a4b8-b2c312c79c85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c6d-b714-3cf55eca50c5" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-7790-a4b8-b2c312c79c85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_019ef4b5-eba1-7e71-bd56-3749ae6f4c20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c6d-b714-3cf55eca50c5" xlink:to="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_019ef4b5-eba1-7e71-bd56-3749ae6f4c20" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_VariableInterestEntityNotPrimaryBeneficiaryConsolidatedEntityExcludingAffiliatedMember_019ef4b5-eba1-7e21-87a7-4dceaf4f7ffc" xlink:href="ahl-20260630.xsd#ahl_VariableInterestEntityNotPrimaryBeneficiaryConsolidatedEntityExcludingAffiliatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c6d-b714-3cf55eca50c5" xlink:to="loc_ahl_VariableInterestEntityNotPrimaryBeneficiaryConsolidatedEntityExcludingAffiliatedMember_019ef4b5-eba1-7e21-87a7-4dceaf4f7ffc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_VariableInterestEntityNotPrimaryBeneficiaryAffiliatedEntityMember_019ef4b5-eba1-7cff-9583-a5ec0c3c89d1" xlink:href="ahl-20260630.xsd#ahl_VariableInterestEntityNotPrimaryBeneficiaryAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7c6d-b714-3cf55eca50c5" xlink:to="loc_ahl_VariableInterestEntityNotPrimaryBeneficiaryAffiliatedEntityMember_019ef4b5-eba1-7cff-9583-a5ec0c3c89d1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7989-92eb-ae8c89924cac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7eba-8a33-605c95282f81" xlink:to="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7989-92eb-ae8c89924cac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7989-92eb-ae8c89924cac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7989-92eb-ae8c89924cac" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7989-92eb-ae8c89924cac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-706d-9b33-2150bcba90a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7989-92eb-ae8c89924cac" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-706d-9b33-2150bcba90a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019ef4b5-eba1-7065-a478-4f03126a40ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-706d-9b33-2150bcba90a0" xlink:to="loc_us-gaap_DebtSecuritiesMember_019ef4b5-eba1-7065-a478-4f03126a40ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019ef4b5-eba1-7f67-a090-6856f7a2cd30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-706d-9b33-2150bcba90a0" xlink:to="loc_us-gaap_EquitySecuritiesMember_019ef4b5-eba1-7f67-a090-6856f7a2cd30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7aa6-ae9d-9ea22db29c9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7eba-8a33-605c95282f81" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7aa6-ae9d-9ea22db29c9c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-7aa6-ae9d-9ea22db29c9c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7aa6-ae9d-9ea22db29c9c" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-7aa6-ae9d-9ea22db29c9c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-70ec-8979-cdab8dd16050" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-eba1-7aa6-ae9d-9ea22db29c9c" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-70ec-8979-cdab8dd16050" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7c27-b470-466e8fbcde8f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ef4b5-eba1-70ec-8979-cdab8dd16050" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-eba1-7c27-b470-466e8fbcde8f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-eba1-711b-82b0-a304b11db8f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7eba-8a33-605c95282f81" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-eba1-711b-82b0-a304b11db8f2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-eba1-711b-82b0-a304b11db8f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-eba1-711b-82b0-a304b11db8f2" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-eba1-711b-82b0-a304b11db8f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-eba1-71e3-b057-fa0e188f1e45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-eba1-711b-82b0-a304b11db8f2" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-eba1-71e3-b057-fa0e188f1e45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-eba1-7069-adb7-57df6bcc787a" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-eba1-71e3-b057-fa0e188f1e45" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-eba1-7069-adb7-57df6bcc787a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019ef4b5-eba1-7117-ad45-625d691cf071" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-eba1-71e3-b057-fa0e188f1e45" xlink:to="loc_us-gaap_DebtSecuritiesMember_019ef4b5-eba1-7117-ad45-625d691cf071" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-732d-aadc-ad1e73f4f123" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-732d-aadc-ad1e73f4f123_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7d07-ae3e-bb9647811793" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_019ef4b5-eba1-7a32-8684-fe023191449c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019ef4b5-eba1-7a76-b8bd-45919c7be510" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7f71-8c6f-ccb0e53c83cf" xlink:to="loc_us-gaap_Assets_019ef4b5-eba1-7a76-b8bd-45919c7be510" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_019ef4b5-eba1-7da4-b7e9-4395dfd4a781" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7f71-8c6f-ccb0e53c83cf" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_019ef4b5-eba1-7da4-b7e9-4395dfd4a781" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/InvestmentsConcentrationofEquityDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#InvestmentsConcentrationofEquityDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/InvestmentsConcentrationofEquityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_019ef4b5-eba1-7a06-858c-1256ee3a8b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_019ef4b5-eba1-77eb-bd1e-416d80fe3eff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019ef4b5-eba1-7a06-858c-1256ee3a8b0d" xlink:to="loc_us-gaap_ConcentrationRiskTable_019ef4b5-eba1-77eb-bd1e-416d80fe3eff" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019ef4b5-eba1-79c1-bae1-e2d56f4726ed" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019ef4b5-eba1-77eb-bd1e-416d80fe3eff" xlink:to="loc_srt_CounterpartyNameAxis_019ef4b5-eba1-79c1-bae1-e2d56f4726ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-79c1-bae1-e2d56f4726ed_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019ef4b5-eba1-79c1-bae1-e2d56f4726ed" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-79c1-bae1-e2d56f4726ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019ef4b5-eba1-79c1-bae1-e2d56f4726ed" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_APGrangeHoldingsLLCMember_019ef4b5-eba1-76bc-ba64-7e131fea1197" xlink:href="ahl-20260630.xsd#ahl_APGrangeHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_APGrangeHoldingsLLCMember_019ef4b5-eba1-76bc-ba64-7e131fea1197" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AtlasMember_019ef4b5-eba1-7d3f-82b7-4f79ceeabff1" xlink:href="ahl-20260630.xsd#ahl_AtlasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_AtlasMember_019ef4b5-eba1-7d3f-82b7-4f79ceeabff1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FoxHedgeL.P.Member_019ef4b5-eba1-7239-86af-cfd7b7c3d9cd" xlink:href="ahl-20260630.xsd#ahl_FoxHedgeL.P.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_FoxHedgeL.P.Member_019ef4b5-eba1-7239-86af-cfd7b7c3d9cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AthoraHoldingLtd.Member_019ef4b5-eba1-7101-ac13-b5bb8ecb18e1" xlink:href="ahl-20260630.xsd#ahl_AthoraHoldingLtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_AthoraHoldingLtd.Member_019ef4b5-eba1-7101-ac13-b5bb8ecb18e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ApolloMultiAssetPrimeSecurities2LLCMember_019ef4b5-eba1-724c-b6f0-19a5161c194d" xlink:href="ahl-20260630.xsd#ahl_ApolloMultiAssetPrimeSecurities2LLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_ApolloMultiAssetPrimeSecurities2LLCMember_019ef4b5-eba1-724c-b6f0-19a5161c194d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ApolloMultiAssetPrimeSecurities3LLCMember_019ef4b5-eba1-7245-8697-a6d465b4daaa" xlink:href="ahl-20260630.xsd#ahl_ApolloMultiAssetPrimeSecurities3LLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_ApolloMultiAssetPrimeSecurities3LLCMember_019ef4b5-eba1-7245-8697-a6d465b4daaa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_APAlkaiosLuxembourgS.a.r.l.Member_019ef4b5-eba1-75d6-b59d-84c576e0fea1" xlink:href="ahl-20260630.xsd#ahl_APAlkaiosLuxembourgS.a.r.l.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_APAlkaiosLuxembourgS.a.r.l.Member_019ef4b5-eba1-75d6-b59d-84c576e0fea1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ApolloMultiAssetPrimeSecurities1LLCMember_019ef4b5-eba1-71b7-af16-e41d0f1c4cfa" xlink:href="ahl-20260630.xsd#ahl_ApolloMultiAssetPrimeSecurities1LLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_ApolloMultiAssetPrimeSecurities1LLCMember_019ef4b5-eba1-71b7-af16-e41d0f1c4cfa" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SVFIIFincoCaymanLPMember_019ef4b5-eba1-737a-b3f3-34a5ef3fb7d7" xlink:href="ahl-20260630.xsd#ahl_SVFIIFincoCaymanLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_SVFIIFincoCaymanLPMember_019ef4b5-eba1-737a-b3f3-34a5ef3fb7d7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AtlasSecuredAdvanceFundingL.P.Member_019ef4b5-eba1-702c-9461-50725636eebc" xlink:href="ahl-20260630.xsd#ahl_AtlasSecuredAdvanceFundingL.P.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_AtlasSecuredAdvanceFundingL.P.Member_019ef4b5-eba1-702c-9461-50725636eebc" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ElectriciteDeFranceSAMember_019ef4b5-eba1-76a4-9d9a-839230118f9d" xlink:href="ahl-20260630.xsd#ahl_ElectriciteDeFranceSAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_ElectriciteDeFranceSAMember_019ef4b5-eba1-76a4-9d9a-839230118f9d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ApolloMultiAssetPrimeSecurities4LLCMember_019f90d4-61af-7e1b-963a-66a22a9c1d23" xlink:href="ahl-20260630.xsd#ahl_ApolloMultiAssetPrimeSecurities4LLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_ApolloMultiAssetPrimeSecurities4LLCMember_019f90d4-61af-7e1b-963a-66a22a9c1d23" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ApolloMultiAssetPrimeSecurities5LLCMember_019f90d6-6713-736a-b764-6a7d0134c681" xlink:href="ahl-20260630.xsd#ahl_ApolloMultiAssetPrimeSecurities5LLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-eba1-7f4d-bc1d-58b402321562" xlink:to="loc_ahl_ApolloMultiAssetPrimeSecurities5LLCMember_019f90d6-6713-736a-b764-6a7d0134c681" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-7b9c-b6bf-f73b40ced551" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019ef4b5-eba1-77eb-bd1e-416d80fe3eff" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-7b9c-b6bf-f73b40ced551" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-7b9c-b6bf-f73b40ced551_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-7b9c-b6bf-f73b40ced551" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-7b9c-b6bf-f73b40ced551_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-783e-a110-fb50a7921ff8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019ef4b5-eba1-7b9c-b6bf-f73b40ced551" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-783e-a110-fb50a7921ff8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityTotalMember_019ef4b5-eba1-7146-acd5-f96740e36ddb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityTotalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019ef4b5-eba1-783e-a110-fb50a7921ff8" xlink:to="loc_us-gaap_StockholdersEquityTotalMember_019ef4b5-eba1-7146-acd5-f96740e36ddb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019ef4b5-eba1-7b47-b416-4ad42a19ddbd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019ef4b5-eba1-77eb-bd1e-416d80fe3eff" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019ef4b5-eba1-7b47-b416-4ad42a19ddbd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019ef4b5-eba1-7b47-b416-4ad42a19ddbd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019ef4b5-eba1-7b47-b416-4ad42a19ddbd" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019ef4b5-eba1-7b47-b416-4ad42a19ddbd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019ef4b5-eba1-705c-bd08-f3b50d00cc2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019ef4b5-eba1-7b47-b416-4ad42a19ddbd" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019ef4b5-eba1-705c-bd08-f3b50d00cc2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019ef4b5-eba1-7d6a-ae74-e38f2e5bac07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019ef4b5-eba1-705c-bd08-f3b50d00cc2c" xlink:to="loc_us-gaap_SubsequentEventMember_019ef4b5-eba1-7d6a-ae74-e38f2e5bac07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019ef4b5-eba1-74b3-9a2a-6b9885ed7036" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019ef4b5-eba1-7a06-858c-1256ee3a8b0d" xlink:to="loc_us-gaap_Investments_019ef4b5-eba1-74b3-9a2a-6b9885ed7036" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019ef4b5-eba1-7619-b218-9c997a5f215d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019ef4b5-eba1-7a06-858c-1256ee3a8b0d" xlink:to="loc_us-gaap_GainLossOnInvestments_019ef4b5-eba1-7619-b218-9c997a5f215d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/DerivativeInstrumentsSummaryofNotionalandFairValueofDerivativeAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#DerivativeInstrumentsSummaryofNotionalandFairValueofDerivativeAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/DerivativeInstrumentsSummaryofNotionalandFairValueofDerivativeAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7625-84c8-10c76980f3db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7625-84c8-10c76980f3db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7625-84c8-10c76980f3db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7625-84c8-10c76980f3db" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7625-84c8-10c76980f3db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7824-8fea-8c7c3815a47b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7625-84c8-10c76980f3db" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7824-8fea-8c7c3815a47b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_019ef4b5-eba1-75fa-9133-047bf8acce4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7824-8fea-8c7c3815a47b" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_019ef4b5-eba1-75fa-9133-047bf8acce4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7de7-b5b4-bdba39254a84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7824-8fea-8c7c3815a47b" xlink:to="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7de7-b5b4-bdba39254a84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7d35-9947-762ffc83fd15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:to="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7d35-9947-762ffc83fd15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7d35-9947-762ffc83fd15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7d35-9947-762ffc83fd15" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7d35-9947-762ffc83fd15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7c05-bdbd-df5d3123c0b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7d35-9947-762ffc83fd15" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7c05-bdbd-df5d3123c0b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7f98-ab28-3d2a02c42b16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7c05-bdbd-df5d3123c0b9" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7f98-ab28-3d2a02c42b16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019ef4b5-eba1-790b-9f68-d511b1182aa9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7c05-bdbd-df5d3123c0b9" xlink:to="loc_us-gaap_NondesignatedMember_019ef4b5-eba1-790b-9f68-d511b1182aa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-72ee-8559-11d191aeb542" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-72ee-8559-11d191aeb542" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-72ee-8559-11d191aeb542_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-72ee-8559-11d191aeb542" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-72ee-8559-11d191aeb542_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-72ee-8559-11d191aeb542" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-744e-88e4-30dd1971f956" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-744e-88e4-30dd1971f956" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-770c-a5f2-ea6ca2482cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-770c-a5f2-ea6ca2482cd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_019ef4b5-eba1-7ac2-80ee-81ad2fdbfea5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_StockOptionMember_019ef4b5-eba1-7ac2-80ee-81ad2fdbfea5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FutureMember_019ef4b5-eba1-7a3a-8672-6fdd183a5f7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_FutureMember_019ef4b5-eba1-7a3a-8672-6fdd183a5f7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-79c3-a601-728f4c1730fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-79c3-a601-728f4c1730fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-eba1-7cad-ae8d-7a4854f89bbb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-eba1-7cad-ae8d-7a4854f89bbb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7c70-9053-96752ffd9293" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7c70-9053-96752ffd9293" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherSwapsMember_019ef4b5-eba1-7e7d-a67a-1f54fdd5d934" xlink:href="ahl-20260630.xsd#ahl_OtherSwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_ahl_OtherSwapsMember_019ef4b5-eba1-7e7d-a67a-1f54fdd5d934" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundsWithheldatInterestMember_019f3dc3-4b63-747b-924c-4c903fd47511" xlink:href="ahl-20260630.xsd#ahl_FundsWithheldatInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_ahl_FundsWithheldatInterestMember_019f3dc3-4b63-747b-924c-4c903fd47511" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractsMember_019f3dc5-8229-7f59-9eb7-cbd381282d2d" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_ahl_InterestSensitiveContractsMember_019f3dc5-8229-7f59-9eb7-cbd381282d2d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019ef4b5-eba1-71c6-bd47-5def8341327b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019ef4b5-eba1-71c6-bd47-5def8341327b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmount_019ef4b5-eba1-7cdb-b8b6-823b25904e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNonmonetaryNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmount_019ef4b5-eba1-7cdb-b8b6-823b25904e9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019ef4b5-eba1-7fbf-bdaa-8c9653960359" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeAssets_019ef4b5-eba1-7fbf-bdaa-8c9653960359" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019ef4b5-eba1-7bba-81d1-6efab9db95c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeLiabilities_019ef4b5-eba1-7bba-81d1-6efab9db95c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset_019ef4b5-eba1-7a27-bce3-ad497b948560" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset_019ef4b5-eba1-7a27-bce3-ad497b948560" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_019ef4b5-eba1-77e5-93d2-09f65afd503e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_019ef4b5-eba1-77e5-93d2-09f65afd503e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019ef4b5-eba1-7209-b5ba-02ab94b44313" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019ef4b5-eba1-7209-b5ba-02ab94b44313" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNetRecordedInOtherComprehensiveIncome_019ef4b5-eba1-7d9b-9230-7314c24022b4" xlink:href="ahl-20260630.xsd#ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNetRecordedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNetRecordedInOtherComprehensiveIncome_019ef4b5-eba1-7d9b-9230-7314c24022b4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_019ef4b5-eba1-7018-8729-178516dfb3b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_019ef4b5-eba1-7018-8729-178516dfb3b2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_019ef4b5-eba1-7e04-b339-c95bacf5da6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_019ef4b5-eba1-7e04-b339-c95bacf5da6e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_019ef4b5-eba1-7919-8b63-6d4b48d245c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_019ef4b5-eba1-7919-8b63-6d4b48d245c9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss_019ef4b5-eba1-74a0-9c8e-55343d2d3c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss_019ef4b5-eba1-74a0-9c8e-55343d2d3c5a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach_019ef4b5-eba1-7e4a-bba8-8b9c801cbc26" xlink:href="ahl-20260630.xsd#ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach_019ef4b5-eba1-7e4a-bba8-8b9c801cbc26" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DerivativeAssetIncludingEmbeddedDerivatives_019ef4b5-eba1-72d2-8bca-684dd9e97683" xlink:href="ahl-20260630.xsd#ahl_DerivativeAssetIncludingEmbeddedDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_ahl_DerivativeAssetIncludingEmbeddedDerivatives_019ef4b5-eba1-72d2-8bca-684dd9e97683" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/DerivativeInstrumentsSummaryofNotionalandFairValueofDerivativeAssetsandLiabilitiesDetails_1" xlink:type="simple" xlink:href="ahl-20260630.xsd#DerivativeInstrumentsSummaryofNotionalandFairValueofDerivativeAssetsandLiabilitiesDetails_1"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/DerivativeInstrumentsSummaryofNotionalandFairValueofDerivativeAssetsandLiabilitiesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7625-84c8-10c76980f3db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7625-84c8-10c76980f3db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7625-84c8-10c76980f3db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7625-84c8-10c76980f3db" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7625-84c8-10c76980f3db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7824-8fea-8c7c3815a47b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7625-84c8-10c76980f3db" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7824-8fea-8c7c3815a47b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_019ef4b5-eba1-75fa-9133-047bf8acce4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7824-8fea-8c7c3815a47b" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_019ef4b5-eba1-75fa-9133-047bf8acce4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7de7-b5b4-bdba39254a84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7824-8fea-8c7c3815a47b" xlink:to="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7de7-b5b4-bdba39254a84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7d35-9947-762ffc83fd15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:to="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7d35-9947-762ffc83fd15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7d35-9947-762ffc83fd15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7d35-9947-762ffc83fd15" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7d35-9947-762ffc83fd15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7c05-bdbd-df5d3123c0b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7d35-9947-762ffc83fd15" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7c05-bdbd-df5d3123c0b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7f98-ab28-3d2a02c42b16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7c05-bdbd-df5d3123c0b9" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7f98-ab28-3d2a02c42b16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019ef4b5-eba1-790b-9f68-d511b1182aa9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7c05-bdbd-df5d3123c0b9" xlink:to="loc_us-gaap_NondesignatedMember_019ef4b5-eba1-790b-9f68-d511b1182aa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-72ee-8559-11d191aeb542" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7bdb-95ba-ef61fdc05cde" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-72ee-8559-11d191aeb542" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-72ee-8559-11d191aeb542_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-72ee-8559-11d191aeb542" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-72ee-8559-11d191aeb542_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-72ee-8559-11d191aeb542" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-744e-88e4-30dd1971f956" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-744e-88e4-30dd1971f956" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-770c-a5f2-ea6ca2482cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-770c-a5f2-ea6ca2482cd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_019ef4b5-eba1-7ac2-80ee-81ad2fdbfea5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_StockOptionMember_019ef4b5-eba1-7ac2-80ee-81ad2fdbfea5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FutureMember_019ef4b5-eba1-7a3a-8672-6fdd183a5f7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_FutureMember_019ef4b5-eba1-7a3a-8672-6fdd183a5f7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-79c3-a601-728f4c1730fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-79c3-a601-728f4c1730fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-eba1-7cad-ae8d-7a4854f89bbb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-eba1-7cad-ae8d-7a4854f89bbb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7c70-9053-96752ffd9293" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7c70-9053-96752ffd9293" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherSwapsMember_019ef4b5-eba1-7e7d-a67a-1f54fdd5d934" xlink:href="ahl-20260630.xsd#ahl_OtherSwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_ahl_OtherSwapsMember_019ef4b5-eba1-7e7d-a67a-1f54fdd5d934" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundsWithheldatInterestMember_019f3dc3-4b63-747b-924c-4c903fd47511" xlink:href="ahl-20260630.xsd#ahl_FundsWithheldatInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_ahl_FundsWithheldatInterestMember_019f3dc3-4b63-747b-924c-4c903fd47511" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractsMember_019f3dc5-8229-7f59-9eb7-cbd381282d2d" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7e40-be17-1f836cf1b804" xlink:to="loc_ahl_InterestSensitiveContractsMember_019f3dc5-8229-7f59-9eb7-cbd381282d2d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmount_019ef4b5-eba1-7cdb-b8b6-823b25904e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNonmonetaryNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmount_019ef4b5-eba1-7cdb-b8b6-823b25904e9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019ef4b5-eba1-7fbf-bdaa-8c9653960359" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeAssets_019ef4b5-eba1-7fbf-bdaa-8c9653960359" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019ef4b5-eba1-7bba-81d1-6efab9db95c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeLiabilities_019ef4b5-eba1-7bba-81d1-6efab9db95c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset_019ef4b5-eba1-7a27-bce3-ad497b948560" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeAsset_019ef4b5-eba1-7a27-bce3-ad497b948560" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_019ef4b5-eba1-77e5-93d2-09f65afd503e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability_019ef4b5-eba1-77e5-93d2-09f65afd503e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019ef4b5-eba1-7209-b5ba-02ab94b44313" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019ef4b5-eba1-7209-b5ba-02ab94b44313" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNetRecordedInOtherComprehensiveIncome_019ef4b5-eba1-7d9b-9230-7314c24022b4" xlink:href="ahl-20260630.xsd#ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNetRecordedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNetRecordedInOtherComprehensiveIncome_019ef4b5-eba1-7d9b-9230-7314c24022b4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_019ef4b5-eba1-7018-8729-178516dfb3b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_019ef4b5-eba1-7018-8729-178516dfb3b2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_019ef4b5-eba1-7e04-b339-c95bacf5da6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_019ef4b5-eba1-7e04-b339-c95bacf5da6e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_019ef4b5-eba1-7919-8b63-6d4b48d245c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_019ef4b5-eba1-7919-8b63-6d4b48d245c9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss_019ef4b5-eba1-74a0-9c8e-55343d2d3c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss_019ef4b5-eba1-74a0-9c8e-55343d2d3c5a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach_019ef4b5-eba1-7e4a-bba8-8b9c801cbc26" xlink:href="ahl-20260630.xsd#ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach_019ef4b5-eba1-7e4a-bba8-8b9c801cbc26" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DerivativeAssetIncludingEmbeddedDerivatives_019ef4b5-eba1-72d2-8bca-684dd9e97683" xlink:href="ahl-20260630.xsd#ahl_DerivativeAssetIncludingEmbeddedDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7321-a362-d1d547bfd581" xlink:to="loc_ahl_DerivativeAssetIncludingEmbeddedDerivatives_019ef4b5-eba1-72d2-8bca-684dd9e97683" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/DerivativeInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#DerivativeInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/DerivativeInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-764c-96f9-bac442fe8c30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-764c-96f9-bac442fe8c30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-764c-96f9-bac442fe8c30_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-764c-96f9-bac442fe8c30" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-764c-96f9-bac442fe8c30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7b52-9b47-db0816d73929" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-764c-96f9-bac442fe8c30" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7b52-9b47-db0816d73929" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019ef4b5-eba1-7acd-8ebe-e9ae581c0895" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7b52-9b47-db0816d73929" xlink:to="loc_us-gaap_CashFlowHedgingMember_019ef4b5-eba1-7acd-8ebe-e9ae581c0895" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7da2-b6fe-2ac18a6c2dde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7b52-9b47-db0816d73929" xlink:to="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7da2-b6fe-2ac18a6c2dde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7b92-bd70-4c98e3002a22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:to="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7b92-bd70-4c98e3002a22" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7b92-bd70-4c98e3002a22_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7b92-bd70-4c98e3002a22" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7b92-bd70-4c98e3002a22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7dca-86a4-55e8b1f6fcd5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7b92-bd70-4c98e3002a22" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7dca-86a4-55e8b1f6fcd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7600-af63-2c289fb9f308" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7dca-86a4-55e8b1f6fcd5" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7600-af63-2c289fb9f308" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-7122-8da6-65e5dcb156a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-7122-8da6-65e5dcb156a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-7820-a9c8-f6c917cc363b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-7820-a9c8-f6c917cc363b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-777c-bb80-880a927b5dfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-777c-bb80-880a927b5dfe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_019ef4b5-eba1-7d94-a963-fa0d0aada8ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_019ef4b5-eba1-7d94-a963-fa0d0aada8ca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7229-803e-13cc032ba88f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7229-803e-13cc032ba88f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDefaultSwapMember_019ef4b5-eba1-7c0d-ae47-1b2874afecae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDefaultSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_CreditDefaultSwapMember_019ef4b5-eba1-7c0d-ae47-1b2874afecae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019ef4b5-eba1-7f46-8b99-995863d4fbb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019ef4b5-eba1-7f46-8b99-995863d4fbb9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019f4389-cd2a-7272-bbdd-61676ac3c845" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019f4389-cd2a-7272-bbdd-61676ac3c845" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f4389-cd2a-7272-bbdd-61676ac3c845_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019f4389-cd2a-7272-bbdd-61676ac3c845" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f4389-cd2a-7272-bbdd-61676ac3c845_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f4389-cd2a-7890-9816-eb289135facd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019f4389-cd2a-7272-bbdd-61676ac3c845" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f4389-cd2a-7890-9816-eb289135facd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractsMember_019f438a-5b6b-7f44-a6ea-c4a9552c6887" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f4389-cd2a-7890-9816-eb289135facd" xlink:to="loc_ahl_InterestSensitiveContractsMember_019f438a-5b6b-7f44-a6ea-c4a9552c6887" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019ef4b5-eba1-7813-9747-41001c620d60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019ef4b5-eba1-7813-9747-41001c620d60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019ef4b5-eba1-7bbe-9a65-544b1530dea3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019ef4b5-eba1-7bbe-9a65-544b1530dea3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_019ef4b5-eba1-769e-9574-1b1abf9bd0a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_019ef4b5-eba1-769e-9574-1b1abf9bd0a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax_019ef4b5-eba1-7766-9242-e10431750163" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax_019ef4b5-eba1-7766-9242-e10431750163" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet_019ef4b5-eba1-76d0-89c9-80758a1834e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet_019ef4b5-eba1-76d0-89c9-80758a1834e6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019ef4b5-eba1-7997-b922-923978f8d7b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_DerivativeLiabilities_019ef4b5-eba1-7997-b922-923978f8d7b0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019ef4b5-eba1-73f4-a0f4-cb6e3adbd189" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_DerivativeAssets_019ef4b5-eba1-73f4-a0f4-cb6e3adbd189" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmount_019ef4b5-eba1-71b9-bf5a-797dd48b6835" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNonmonetaryNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmount_019ef4b5-eba1-71b9-bf5a-797dd48b6835" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease_019fb365-6e2e-72f0-b64e-62d7e0a79a1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease_019fb365-6e2e-72f0-b64e-62d7e0a79a1c" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/DerivativeInstrumentsNarrativeDetails_1" xlink:type="simple" xlink:href="ahl-20260630.xsd#DerivativeInstrumentsNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/DerivativeInstrumentsNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-764c-96f9-bac442fe8c30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-764c-96f9-bac442fe8c30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-764c-96f9-bac442fe8c30_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-764c-96f9-bac442fe8c30" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-764c-96f9-bac442fe8c30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7b52-9b47-db0816d73929" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-764c-96f9-bac442fe8c30" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7b52-9b47-db0816d73929" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019ef4b5-eba1-7acd-8ebe-e9ae581c0895" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7b52-9b47-db0816d73929" xlink:to="loc_us-gaap_CashFlowHedgingMember_019ef4b5-eba1-7acd-8ebe-e9ae581c0895" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7da2-b6fe-2ac18a6c2dde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7b52-9b47-db0816d73929" xlink:to="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7da2-b6fe-2ac18a6c2dde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7b92-bd70-4c98e3002a22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:to="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7b92-bd70-4c98e3002a22" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7b92-bd70-4c98e3002a22_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7b92-bd70-4c98e3002a22" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7b92-bd70-4c98e3002a22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7dca-86a4-55e8b1f6fcd5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7b92-bd70-4c98e3002a22" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7dca-86a4-55e8b1f6fcd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7600-af63-2c289fb9f308" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7dca-86a4-55e8b1f6fcd5" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7600-af63-2c289fb9f308" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7c37-a90e-7a3c6b8366a5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-7122-8da6-65e5dcb156a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-7122-8da6-65e5dcb156a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-7820-a9c8-f6c917cc363b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-7820-a9c8-f6c917cc363b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-777c-bb80-880a927b5dfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-777c-bb80-880a927b5dfe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_019ef4b5-eba1-7d94-a963-fa0d0aada8ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_019ef4b5-eba1-7d94-a963-fa0d0aada8ca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7229-803e-13cc032ba88f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7229-803e-13cc032ba88f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDefaultSwapMember_019ef4b5-eba1-7c0d-ae47-1b2874afecae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDefaultSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7b48-a182-316ee11afe63" xlink:to="loc_us-gaap_CreditDefaultSwapMember_019ef4b5-eba1-7c0d-ae47-1b2874afecae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019f4389-cd2a-7272-bbdd-61676ac3c845" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7a65-9061-4eed187efe27" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019f4389-cd2a-7272-bbdd-61676ac3c845" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f4389-cd2a-7272-bbdd-61676ac3c845_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019f4389-cd2a-7272-bbdd-61676ac3c845" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f4389-cd2a-7272-bbdd-61676ac3c845_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f4389-cd2a-7890-9816-eb289135facd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019f4389-cd2a-7272-bbdd-61676ac3c845" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f4389-cd2a-7890-9816-eb289135facd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractsMember_019f438a-5b6b-7f44-a6ea-c4a9552c6887" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f4389-cd2a-7890-9816-eb289135facd" xlink:to="loc_ahl_InterestSensitiveContractsMember_019f438a-5b6b-7f44-a6ea-c4a9552c6887" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019ef4b5-eba1-7813-9747-41001c620d60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019ef4b5-eba1-7813-9747-41001c620d60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019ef4b5-eba1-7bbe-9a65-544b1530dea3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_019ef4b5-eba1-7bbe-9a65-544b1530dea3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_019ef4b5-eba1-769e-9574-1b1abf9bd0a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_019ef4b5-eba1-769e-9574-1b1abf9bd0a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax_019ef4b5-eba1-7766-9242-e10431750163" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax_019ef4b5-eba1-7766-9242-e10431750163" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet_019ef4b5-eba1-76d0-89c9-80758a1834e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet_019ef4b5-eba1-76d0-89c9-80758a1834e6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019ef4b5-eba1-7997-b922-923978f8d7b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_DerivativeLiabilities_019ef4b5-eba1-7997-b922-923978f8d7b0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019ef4b5-eba1-73f4-a0f4-cb6e3adbd189" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_DerivativeAssets_019ef4b5-eba1-73f4-a0f4-cb6e3adbd189" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmount_019ef4b5-eba1-71b9-bf5a-797dd48b6835" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNonmonetaryNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmount_019ef4b5-eba1-71b9-bf5a-797dd48b6835" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease_019fb365-6e2e-72f0-b64e-62d7e0a79a1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-7912-939b-a752b91606fd" xlink:to="loc_us-gaap_HedgedLiabilityFairValueHedgeCumulativeIncreaseDecrease_019fb365-6e2e-72f0-b64e-62d7e0a79a1c" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/DerivativeInstrumentsOffsettingAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#DerivativeInstrumentsOffsettingAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/DerivativeInstrumentsOffsettingAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-797e-a13e-59c23d87ef64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7235-b6ee-c9cf38ff33a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-797e-a13e-59c23d87ef64" xlink:to="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7235-b6ee-c9cf38ff33a6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-730f-8c6a-216dd8a2c29f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7235-b6ee-c9cf38ff33a6" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-730f-8c6a-216dd8a2c29f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-730f-8c6a-216dd8a2c29f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-730f-8c6a-216dd8a2c29f" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-730f-8c6a-216dd8a2c29f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-76ff-b5ba-8fc8ee435e9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-730f-8c6a-216dd8a2c29f" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-76ff-b5ba-8fc8ee435e9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-78df-8243-ebdcbdac4c85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-76ff-b5ba-8fc8ee435e9d" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-78df-8243-ebdcbdac4c85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-753b-859a-5e6d3d42c5c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-76ff-b5ba-8fc8ee435e9d" xlink:to="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-753b-859a-5e6d3d42c5c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7fd6-8f19-96b6f22427c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-76ff-b5ba-8fc8ee435e9d" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7fd6-8f19-96b6f22427c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-7902-8cb4-17447f2dcf99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-76ff-b5ba-8fc8ee435e9d" xlink:to="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-7902-8cb4-17447f2dcf99" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeMember_019ef4b5-eba1-76e0-8516-5d9e68fb6211" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-76ff-b5ba-8fc8ee435e9d" xlink:to="loc_us-gaap_ForeignExchangeMember_019ef4b5-eba1-76e0-8516-5d9e68fb6211" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-727e-adc3-a9c083a495bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7235-b6ee-c9cf38ff33a6" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-727e-adc3-a9c083a495bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-727e-adc3-a9c083a495bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-727e-adc3-a9c083a495bc" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-727e-adc3-a9c083a495bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7563-b904-83ec0150af47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-727e-adc3-a9c083a495bc" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7563-b904-83ec0150af47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7142-adae-4084a52c1f2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7563-b904-83ec0150af47" xlink:to="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7142-adae-4084a52c1f2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7782-9d5a-51e00761d32e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7235-b6ee-c9cf38ff33a6" xlink:to="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7782-9d5a-51e00761d32e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7782-9d5a-51e00761d32e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7782-9d5a-51e00761d32e" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7782-9d5a-51e00761d32e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-79a4-afbc-b33463dcbb1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7782-9d5a-51e00761d32e" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-79a4-afbc-b33463dcbb1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7b4d-a70e-8e254ba63dab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-79a4-afbc-b33463dcbb1b" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7b4d-a70e-8e254ba63dab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019f3df6-62eb-72af-bb26-34d39b984d80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-7235-b6ee-c9cf38ff33a6" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019f3df6-62eb-72af-bb26-34d39b984d80" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f3df6-62eb-72af-bb26-34d39b984d80_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019f3df6-62eb-72af-bb26-34d39b984d80" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f3df6-62eb-72af-bb26-34d39b984d80_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f3df6-62eb-77d0-b412-08eaddabdfd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019f3df6-62eb-72af-bb26-34d39b984d80" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f3df6-62eb-77d0-b412-08eaddabdfd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019f3df6-a543-7a0f-8bfe-d46df6e657a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f3df6-62eb-77d0-b412-08eaddabdfd8" xlink:to="loc_us-gaap_DebtSecuritiesMember_019f3df6-a543-7a0f-8bfe-d46df6e657a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractsMember_019f4390-4a2a-7c9c-80e6-5f27957bc19f" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019f3df6-62eb-77d0-b412-08eaddabdfd8" xlink:to="loc_ahl_InterestSensitiveContractsMember_019f4390-4a2a-7c9c-80e6-5f27957bc19f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAmountOfHedgedItem_019ef4b5-eba1-711d-b7d9-18c9b3d95d6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAmountOfHedgedItem"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-797e-a13e-59c23d87ef64" xlink:to="loc_us-gaap_DerivativeAmountOfHedgedItem_019ef4b5-eba1-711d-b7d9-18c9b3d95d6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffsettingDerivativeAssetsAbstract_019ef4b5-eba1-7d8c-a1a4-e55d47dca9ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OffsettingDerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-797e-a13e-59c23d87ef64" xlink:to="loc_us-gaap_OffsettingDerivativeAssetsAbstract_019ef4b5-eba1-7d8c-a1a4-e55d47dca9ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019ef4b5-eba1-7d48-9719-f059e794b274" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_019ef4b5-eba1-7d8c-a1a4-e55d47dca9ce" xlink:to="loc_us-gaap_DerivativeAssets_019ef4b5-eba1-7d48-9719-f059e794b274" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnSecurities_019ef4b5-eba1-7fb4-a546-928f45faac48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeCollateralObligationToReturnSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_019ef4b5-eba1-7d8c-a1a4-e55d47dca9ce" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnSecurities_019ef4b5-eba1-7fb4-a546-928f45faac48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_019ef4b5-eba1-723a-9248-5fb6ce56fd67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeCollateralObligationToReturnCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_019ef4b5-eba1-7d8c-a1a4-e55d47dca9ce" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_019ef4b5-eba1-723a-9248-5fb6ce56fd67" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DerivativeAssetFairValueOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElectionExcludingObligationtoReturnSecurities_019ef4b5-eba1-7cca-a677-375b4a0e45ef" xlink:href="ahl-20260630.xsd#ahl_DerivativeAssetFairValueOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElectionExcludingObligationtoReturnSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_019ef4b5-eba1-7d8c-a1a4-e55d47dca9ce" xlink:to="loc_ahl_DerivativeAssetFairValueOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElectionExcludingObligationtoReturnSecurities_019ef4b5-eba1-7cca-a677-375b4a0e45ef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_019ef4b5-eba1-73a9-a6f1-3e3b53f2816a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_019ef4b5-eba1-7d8c-a1a4-e55d47dca9ce" xlink:to="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_019ef4b5-eba1-73a9-a6f1-3e3b53f2816a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset_019ef4b5-eba1-7aaf-8e55-295f14ee218e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_019ef4b5-eba1-7d8c-a1a4-e55d47dca9ce" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset_019ef4b5-eba1-7aaf-8e55-295f14ee218e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitySecuritySoldUnderAgreementToRepurchaseSecurityLoanedAfterOffsetAndDeductionSubjectToMasterNettingArrangement_019ef4b5-eba1-76c6-ac66-fda522baa028" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilitySecuritySoldUnderAgreementToRepurchaseSecurityLoanedAfterOffsetAndDeductionSubjectToMasterNettingArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_019ef4b5-eba1-7d8c-a1a4-e55d47dca9ce" xlink:to="loc_us-gaap_DerivativeLiabilitySecuritySoldUnderAgreementToRepurchaseSecurityLoanedAfterOffsetAndDeductionSubjectToMasterNettingArrangement_019ef4b5-eba1-76c6-ac66-fda522baa028" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_019ef4b5-eba1-7224-a897-91e7fa850578" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OffsettingDerivativeLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-797e-a13e-59c23d87ef64" xlink:to="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_019ef4b5-eba1-7224-a897-91e7fa850578" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019ef4b5-eba1-7bfb-bf3f-fd64e49f9290" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_019ef4b5-eba1-7224-a897-91e7fa850578" xlink:to="loc_us-gaap_DerivativeLiabilities_019ef4b5-eba1-7bfb-bf3f-fd64e49f9290" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimSecurities_019ef4b5-eba1-7ee4-8da4-81eacf03548b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeCollateralRightToReclaimSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_019ef4b5-eba1-7224-a897-91e7fa850578" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimSecurities_019ef4b5-eba1-7ee4-8da4-81eacf03548b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_019ef4b5-eba1-71c3-aade-d05158c425e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeCollateralRightToReclaimCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_019ef4b5-eba1-7224-a897-91e7fa850578" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_019ef4b5-eba1-71c3-aade-d05158c425e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DerivativeLiabilityFairValueOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElectionExcludingRighttoReclaimSecurities_019ef4b5-eba1-7cef-9e36-601f08604da2" xlink:href="ahl-20260630.xsd#ahl_DerivativeLiabilityFairValueOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElectionExcludingRighttoReclaimSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_019ef4b5-eba1-7224-a897-91e7fa850578" xlink:to="loc_ahl_DerivativeLiabilityFairValueOffsetAgainstCollateralNetofNotSubjecttoMasterNettingArrangementPolicyElectionExcludingRighttoReclaimSecurities_019ef4b5-eba1-7cef-9e36-601f08604da2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_019ef4b5-eba1-72e6-ab4a-6adbb20b9277" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_019ef4b5-eba1-7224-a897-91e7fa850578" xlink:to="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_019ef4b5-eba1-72e6-ab4a-6adbb20b9277" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/DerivativeInstrumentsGainsLossesonDerivativesNotDesignatedasHedgingDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#DerivativeInstrumentsGainsLossesonDerivativesNotDesignatedasHedgingDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/DerivativeInstrumentsGainsLossesonDerivativesNotDesignatedasHedgingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7865-9dab-6b794d64748b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7865-9dab-6b794d64748b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7865-9dab-6b794d64748b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7865-9dab-6b794d64748b" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7865-9dab-6b794d64748b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7133-8bf3-52f78f972cf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7865-9dab-6b794d64748b" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7133-8bf3-52f78f972cf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019ef4b5-eba1-7bf1-8d3d-a9b02ad58891" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7133-8bf3-52f78f972cf6" xlink:to="loc_us-gaap_CashFlowHedgingMember_019ef4b5-eba1-7bf1-8d3d-a9b02ad58891" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7791-9088-aa144c69fc7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7133-8bf3-52f78f972cf6" xlink:to="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7791-9088-aa144c69fc7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7019-9b9a-2b242937eeac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:to="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7019-9b9a-2b242937eeac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7019-9b9a-2b242937eeac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7019-9b9a-2b242937eeac" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7019-9b9a-2b242937eeac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7eea-8349-d39d0781b250" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7019-9b9a-2b242937eeac" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7eea-8349-d39d0781b250" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7c87-b603-846dd59dfa23" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7eea-8349-d39d0781b250" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7c87-b603-846dd59dfa23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019ef4b5-eba1-70d8-a341-7fbc32e7a350" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019ef4b5-eba1-70d8-a341-7fbc32e7a350" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7826-b59a-0105fb79a217" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7826-b59a-0105fb79a217" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7826-b59a-0105fb79a217_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7826-b59a-0105fb79a217" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7826-b59a-0105fb79a217_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7826-b59a-0105fb79a217" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_019ef4b5-eba1-75a7-a335-47deaa9e1d0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_StockOptionMember_019ef4b5-eba1-75a7-a335-47deaa9e1d0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FutureMember_019ef4b5-eba1-7369-b0d8-ab3577cdc733" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_FutureMember_019ef4b5-eba1-7369-b0d8-ab3577cdc733" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SwapMember_019ef4b5-eba1-74e4-99e1-6a9ed3621a6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_SwapMember_019ef4b5-eba1-74e4-99e1-6a9ed3621a6d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-7f14-8827-ed12e03f7352" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-7f14-8827-ed12e03f7352" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-7f68-8461-21bb6f03e0d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-7f68-8461-21bb6f03e0d7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-758a-a977-bc919e029697" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-758a-a977-bc919e029697" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-eba1-70c9-b3af-ed76c3b4c59b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-eba1-70c9-b3af-ed76c3b4c59b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7574-b4ec-10f78238938a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7574-b4ec-10f78238938a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019ef4b5-eba1-795a-a4bc-dd750546bda6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019ef4b5-eba1-795a-a4bc-dd750546bda6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_019ef4b5-eba1-7174-a0ec-14841e3fd2d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_019ef4b5-eba1-7174-a0ec-14841e3fd2d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_019ef4b5-eba1-79e7-a7a8-8a1f39a6c837" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_019ef4b5-eba1-79e7-a7a8-8a1f39a6c837" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss_019ef4b5-eba1-791f-a5a5-52e5df32b2cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss_019ef4b5-eba1-791f-a5a5-52e5df32b2cf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach_019ef4b5-eba1-735c-9a54-f126d5b7515b" xlink:href="ahl-20260630.xsd#ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach_019ef4b5-eba1-735c-9a54-f126d5b7515b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_019ef4b5-eba1-7e42-abbb-2553b4d59509" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_019ef4b5-eba1-7e42-abbb-2553b4d59509" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/DerivativeInstrumentsGainsLossesonDerivativesNotDesignatedasHedgingDetails_1" xlink:type="simple" xlink:href="ahl-20260630.xsd#DerivativeInstrumentsGainsLossesonDerivativesNotDesignatedasHedgingDetails_1"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/DerivativeInstrumentsGainsLossesonDerivativesNotDesignatedasHedgingDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7865-9dab-6b794d64748b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7865-9dab-6b794d64748b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7865-9dab-6b794d64748b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7865-9dab-6b794d64748b" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7865-9dab-6b794d64748b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7133-8bf3-52f78f972cf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019ef4b5-eba1-7865-9dab-6b794d64748b" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7133-8bf3-52f78f972cf6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019ef4b5-eba1-7bf1-8d3d-a9b02ad58891" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7133-8bf3-52f78f972cf6" xlink:to="loc_us-gaap_CashFlowHedgingMember_019ef4b5-eba1-7bf1-8d3d-a9b02ad58891" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7791-9088-aa144c69fc7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019ef4b5-eba1-7133-8bf3-52f78f972cf6" xlink:to="loc_us-gaap_FairValueHedgingMember_019ef4b5-eba1-7791-9088-aa144c69fc7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7019-9b9a-2b242937eeac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:to="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7019-9b9a-2b242937eeac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7019-9b9a-2b242937eeac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7019-9b9a-2b242937eeac" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7019-9b9a-2b242937eeac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7eea-8349-d39d0781b250" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019ef4b5-eba1-7019-9b9a-2b242937eeac" xlink:to="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7eea-8349-d39d0781b250" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7c87-b603-846dd59dfa23" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019ef4b5-eba1-7eea-8349-d39d0781b250" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019ef4b5-eba1-7c87-b603-846dd59dfa23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7826-b59a-0105fb79a217" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019ef4b5-eba1-72d6-a62d-c9a0dba74bb1" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7826-b59a-0105fb79a217" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7826-b59a-0105fb79a217_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7826-b59a-0105fb79a217" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-7826-b59a-0105fb79a217_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-eba1-7826-b59a-0105fb79a217" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_019ef4b5-eba1-75a7-a335-47deaa9e1d0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_StockOptionMember_019ef4b5-eba1-75a7-a335-47deaa9e1d0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FutureMember_019ef4b5-eba1-7369-b0d8-ab3577cdc733" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_FutureMember_019ef4b5-eba1-7369-b0d8-ab3577cdc733" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SwapMember_019ef4b5-eba1-74e4-99e1-6a9ed3621a6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_SwapMember_019ef4b5-eba1-74e4-99e1-6a9ed3621a6d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-7f14-8827-ed12e03f7352" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_CurrencySwapMember_019ef4b5-eba1-7f14-8827-ed12e03f7352" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-7f68-8461-21bb6f03e0d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_InterestRateSwapMember_019ef4b5-eba1-7f68-8461-21bb6f03e0d7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-758a-a977-bc919e029697" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019ef4b5-eba1-758a-a977-bc919e029697" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-eba1-70c9-b3af-ed76c3b4c59b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-eba1-70c9-b3af-ed76c3b4c59b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7574-b4ec-10f78238938a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CrossCurrencyInterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-eba1-73b4-ab05-aca7041035a7" xlink:to="loc_us-gaap_CrossCurrencyInterestRateContractMember_019ef4b5-eba1-7574-b4ec-10f78238938a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019ef4b5-eba1-795a-a4bc-dd750546bda6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019ef4b5-eba1-795a-a4bc-dd750546bda6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_019ef4b5-eba1-7174-a0ec-14841e3fd2d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_019ef4b5-eba1-7174-a0ec-14841e3fd2d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_019ef4b5-eba1-79e7-a7a8-8a1f39a6c837" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_019ef4b5-eba1-79e7-a7a8-8a1f39a6c837" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss_019ef4b5-eba1-791f-a5a5-52e5df32b2cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_DerivativeFairValueHedgeIncludedInEffectivenessGainLoss_019ef4b5-eba1-791f-a5a5-52e5df32b2cf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach_019ef4b5-eba1-735c-9a54-f126d5b7515b" xlink:href="ahl-20260630.xsd#ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_ahl_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessAmortizationApproach_019ef4b5-eba1-735c-9a54-f126d5b7515b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_019ef4b5-eba1-7e42-abbb-2553b4d59509" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019ef4b5-eba1-77cf-aa9d-54bf94b9ef3f" xlink:to="loc_us-gaap_GainLossFromComponentsExcludedFromAssessmentOfFairValueHedgeEffectivenessNet_019ef4b5-eba1-7e42-abbb-2553b4d59509" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/VariableInterestEntitiesDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#VariableInterestEntitiesDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/VariableInterestEntitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7db6-8ac0-43f5261611ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7311-9336-d7f886afd9ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7db6-8ac0-43f5261611ea" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7311-9336-d7f886afd9ed" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7685-bc15-7fe689516c69" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7311-9336-d7f886afd9ed" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7685-bc15-7fe689516c69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7685-bc15-7fe689516c69_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7685-bc15-7fe689516c69" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-7685-bc15-7fe689516c69_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-764d-926f-0ed8e6cf8ede" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-eba1-7685-bc15-7fe689516c69" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-764d-926f-0ed8e6cf8ede" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-7329-a070-83678249c47b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-eba1-764d-926f-0ed8e6cf8ede" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-eba1-7329-a070-83678249c47b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7a91-97a5-2cc67ba62874" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7311-9336-d7f886afd9ed" xlink:to="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7a91-97a5-2cc67ba62874" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7a91-97a5-2cc67ba62874_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7a91-97a5-2cc67ba62874" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7a91-97a5-2cc67ba62874_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7569-9a83-b9ba0aded0b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-eba1-7a91-97a5-2cc67ba62874" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7569-9a83-b9ba0aded0b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-eba1-79db-acfe-048e54965c78" xlink:href="ahl-20260630.xsd#ahl_DebtSecuritiesTradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7569-9a83-b9ba0aded0b5" xlink:to="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-eba1-79db-acfe-048e54965c78" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_019ef4b5-eba1-706e-acd0-4813fd1817e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7569-9a83-b9ba0aded0b5" xlink:to="loc_us-gaap_MortgagesMember_019ef4b5-eba1-706e-acd0-4813fd1817e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-eba1-728d-b3b5-4482f5299dfd" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7569-9a83-b9ba0aded0b5" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-eba1-728d-b3b5-4482f5299dfd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentsOtherMember_019ef5ee-0e4f-7d2b-9817-3932ccca0153" xlink:href="ahl-20260630.xsd#ahl_InvestmentsOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-eba1-7569-9a83-b9ba0aded0b5" xlink:to="loc_ahl_InvestmentsOtherMember_019ef5ee-0e4f-7d2b-9817-3932ccca0153" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-77ea-bbc3-0bf00d9f2aad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ef4b5-eba1-7311-9336-d7f886afd9ed" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-77ea-bbc3-0bf00d9f2aad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-77ea-bbc3-0bf00d9f2aad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-77ea-bbc3-0bf00d9f2aad" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-77ea-bbc3-0bf00d9f2aad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7c5f-a0ef-f1927a0c32ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-eba1-77ea-bbc3-0bf00d9f2aad" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7c5f-a0ef-f1927a0c32ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019ef4b5-eba1-7313-b9dc-4503ea1f47de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7c5f-a0ef-f1927a0c32ec" xlink:to="loc_us-gaap_LoansReceivableMember_019ef4b5-eba1-7313-b9dc-4503ea1f47de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-eba1-77ef-b4c4-5552c7dda322" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7c5f-a0ef-f1927a0c32ec" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-eba1-77ef-b4c4-5552c7dda322" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-eba1-7979-a66d-d06b183b0997" xlink:href="ahl-20260630.xsd#ahl_DebtSecuritiesTradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-eba1-7c5f-a0ef-f1927a0c32ec" xlink:to="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-eba1-7979-a66d-d06b183b0997" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossInvestmentIncomeOperating_019ef4b5-eba1-76c3-9d11-7841384e5e1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7db6-8ac0-43f5261611ea" xlink:to="loc_us-gaap_GrossInvestmentIncomeOperating_019ef4b5-eba1-76c3-9d11-7841384e5e1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsGainLoss_019ef4b5-eba1-7b14-94b4-787704d5b5dd" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7db6-8ac0-43f5261611ea" xlink:to="loc_ahl_InvestmentFundsGainLoss_019ef4b5-eba1-7b14-94b4-787704d5b5dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019ef4b5-eba1-7610-9e7b-46d280a1e398" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7db6-8ac0-43f5261611ea" xlink:to="loc_us-gaap_NetInvestmentIncome_019ef4b5-eba1-7610-9e7b-46d280a1e398" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019ef4b5-eba1-71fe-92b1-1fe2d6f81fc8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7db6-8ac0-43f5261611ea" xlink:to="loc_us-gaap_GainLossOnInvestments_019ef4b5-eba1-71fe-92b1-1fe2d6f81fc8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingGainsLosses_019ef4b5-eba1-7391-bcfc-100c826dd984" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7db6-8ac0-43f5261611ea" xlink:to="loc_us-gaap_OtherNonoperatingGainsLosses_019ef4b5-eba1-7391-bcfc-100c826dd984" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherInvestments_019ef4b5-eba1-7beb-8f21-21ac54f42898" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfOtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ef4b5-eba1-7db6-8ac0-43f5261611ea" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherInvestments_019ef4b5-eba1-7beb-8f21-21ac54f42898" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/FairValueAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#FairValueAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/FairValueAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-eba1-7e1c-a307-f6b7ae7e2a71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-eba1-7e1c-a307-f6b7ae7e2a71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-eba1-7e1c-a307-f6b7ae7e2a71_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-eba1-7e1c-a307-f6b7ae7e2a71" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-eba1-7e1c-a307-f6b7ae7e2a71_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-eba1-7f39-a5bd-74f4d26ff062" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-eba1-7e1c-a307-f6b7ae7e2a71" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-eba1-7f39-a5bd-74f4d26ff062" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-eba1-7efa-b97d-d6563d569353" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-eba1-7f39-a5bd-74f4d26ff062" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-eba1-7efa-b97d-d6563d569353" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019ef4b5-eba1-741b-9e42-0167568621de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-eba1-7f39-a5bd-74f4d26ff062" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019ef4b5-eba1-741b-9e42-0167568621de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019ef4b5-eba1-791b-8c58-82edfe3838ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019ef4b5-eba1-791b-8c58-82edfe3838ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019ef4b5-eba1-791b-8c58-82edfe3838ca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019ef4b5-eba1-791b-8c58-82edfe3838ca" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019ef4b5-eba1-791b-8c58-82edfe3838ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019ef4b5-eba1-7903-b80a-aee190524e76" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019ef4b5-eba1-791b-8c58-82edfe3838ca" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019ef4b5-eba1-7903-b80a-aee190524e76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019ef4b5-eba1-77ec-92bc-21d7afa04514" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019ef4b5-eba1-7903-b80a-aee190524e76" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019ef4b5-eba1-77ec-92bc-21d7afa04514" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-eba1-752e-b882-2a896036bc2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-eba1-752e-b882-2a896036bc2d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-eba1-752e-b882-2a896036bc2d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-eba1-752e-b882-2a896036bc2d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-eba1-752e-b882-2a896036bc2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-eba1-73f8-8b46-bf4e4f74c4d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-eba1-752e-b882-2a896036bc2d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-eba1-73f8-8b46-bf4e4f74c4d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019ef4b5-eba1-7775-bd4f-3dfd4ca20fb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-eba1-73f8-8b46-bf4e4f74c4d0" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019ef4b5-eba1-7775-bd4f-3dfd4ca20fb7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019ef4b5-ec6f-7ce0-96be-21ed974b7e03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-eba1-73f8-8b46-bf4e4f74c4d0" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019ef4b5-ec6f-7ce0-96be-21ed974b7e03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019ef4b5-ec6f-7ae0-af19-dd2f1f7374a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-eba1-73f8-8b46-bf4e4f74c4d0" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019ef4b5-ec6f-7ae0-af19-dd2f1f7374a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019ef4b5-ec6f-7d60-ae45-523fc852cc10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-eba1-73f8-8b46-bf4e4f74c4d0" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019ef4b5-ec6f-7d60-ae45-523fc852cc10" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7df0-ad65-bf439405256a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7df0-ad65-bf439405256a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7df0-ad65-bf439405256a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7df0-ad65-bf439405256a" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7df0-ad65-bf439405256a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7d3c-b533-e11c874c1163" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7df0-ad65-bf439405256a" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7d3c-b533-e11c874c1163" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_019ef4b5-ec6f-72b7-912c-16c931fdbcda" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7d3c-b533-e11c874c1163" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_019ef4b5-ec6f-72b7-912c-16c931fdbcda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-ec6f-7f71-9789-d7bf2674a4bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7d3c-b533-e11c874c1163" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-ec6f-7f71-9789-d7bf2674a4bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-ec6f-743e-b83c-9ae2ec9e8281" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7d3c-b533-e11c874c1163" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-ec6f-743e-b83c-9ae2ec9e8281" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec6f-7a22-89a1-a2f1a0d0e503" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7d3c-b533-e11c874c1163" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec6f-7a22-89a1-a2f1a0d0e503" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-ec6f-7e56-9d98-decf635481e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7d3c-b533-e11c874c1163" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-ec6f-7e56-9d98-decf635481e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-ec6f-7474-a77e-a98e26fd2b7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7d3c-b533-e11c874c1163" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-ec6f-7474-a77e-a98e26fd2b7d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-ec6f-7fce-8453-c9c0927fc57f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7d3c-b533-e11c874c1163" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-ec6f-7fce-8453-c9c0927fc57f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-ec6f-747b-a62a-48f3c6ea474a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7d3c-b533-e11c874c1163" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-ec6f-747b-a62a-48f3c6ea474a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec6f-7c8c-ac31-c633df35d040" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec6f-7c8c-ac31-c633df35d040" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec6f-7c8c-ac31-c633df35d040_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec6f-7c8c-ac31-c633df35d040" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec6f-7c8c-ac31-c633df35d040_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec6f-72b7-8263-d7b2e6d22e36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec6f-7c8c-ac31-c633df35d040" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec6f-72b7-8263-d7b2e6d22e36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-ec6f-7d7a-a1da-4cf5834e7186" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec6f-72b7-8263-d7b2e6d22e36" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-ec6f-7d7a-a1da-4cf5834e7186" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundsWithheldatInterestMember_019f3e16-6844-7b3e-9f06-a3f79203859c" xlink:href="ahl-20260630.xsd#ahl_FundsWithheldatInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec6f-72b7-8263-d7b2e6d22e36" xlink:to="loc_ahl_FundsWithheldatInterestMember_019f3e16-6844-7b3e-9f06-a3f79203859c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec6f-71b7-be13-e6dcf6eb9b82" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec6f-71b7-be13-e6dcf6eb9b82" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec6f-71b7-be13-e6dcf6eb9b82_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec6f-71b7-be13-e6dcf6eb9b82" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec6f-71b7-be13-e6dcf6eb9b82_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec6f-7bad-bcff-573d44a3b46b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec6f-71b7-be13-e6dcf6eb9b82" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec6f-7bad-bcff-573d44a3b46b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019ef4b5-ec6f-75e4-82df-fd8ab52ebb27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec6f-7bad-bcff-573d44a3b46b" xlink:to="loc_us-gaap_UniversalLifeMember_019ef4b5-ec6f-75e4-82df-fd8ab52ebb27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AmerUsClosedBlockMember_019ef4b5-ec6f-7755-beac-17b96f918ab8" xlink:href="ahl-20260630.xsd#ahl_AmerUsClosedBlockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec6f-7bad-bcff-573d44a3b46b" xlink:to="loc_ahl_AmerUsClosedBlockMember_019ef4b5-ec6f-7755-beac-17b96f918ab8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_IndianapolisLifeInsuranceCompanyClosedBlockMember_019ef4b5-ec6f-7b5b-991e-ec70703515e1" xlink:href="ahl-20260630.xsd#ahl_IndianapolisLifeInsuranceCompanyClosedBlockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec6f-7bad-bcff-573d44a3b46b" xlink:to="loc_ahl_IndianapolisLifeInsuranceCompanyClosedBlockMember_019ef4b5-ec6f-7b5b-991e-ec70703515e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec6f-7acb-95ce-95db9f2df607" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec6f-7acb-95ce-95db9f2df607" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec6f-7acb-95ce-95db9f2df607_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec6f-7acb-95ce-95db9f2df607" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec6f-7acb-95ce-95db9f2df607_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec6f-7ec0-ad68-1ea2f4a02dae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec6f-7acb-95ce-95db9f2df607" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec6f-7ec0-ad68-1ea2f4a02dae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec6f-72db-87a5-91908155fd98" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec6f-7ec0-ad68-1ea2f4a02dae" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec6f-72db-87a5-91908155fd98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec6f-7d19-b1f2-4981a3abf6a6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec6f-7d19-b1f2-4981a3abf6a6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec6f-7d19-b1f2-4981a3abf6a6_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec6f-7d19-b1f2-4981a3abf6a6" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec6f-7d19-b1f2-4981a3abf6a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec6f-754f-9328-f10d3de0c8dd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec6f-7d19-b1f2-4981a3abf6a6" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec6f-754f-9328-f10d3de0c8dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-ec6f-7e90-8f28-a2badc78924f" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec6f-754f-9328-f10d3de0c8dd" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-ec6f-7e90-8f28-a2badc78924f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec6f-7613-85f6-6fb7b3bd107b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec6f-754f-9328-f10d3de0c8dd" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec6f-7613-85f6-6fb7b3bd107b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-ec6f-7886-aa97-575dec7266a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec6f-754f-9328-f10d3de0c8dd" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-ec6f-7886-aa97-575dec7266a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingVariableInterestEntitiesVIEandInvestmentsinRelatedPartyMember_019ef4b5-ec6f-7b31-8f20-caf35395868c" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingVariableInterestEntitiesVIEandInvestmentsinRelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec6f-754f-9328-f10d3de0c8dd" xlink:to="loc_ahl_ConsolidatedEntityExcludingVariableInterestEntitiesVIEandInvestmentsinRelatedPartyMember_019ef4b5-ec6f-7b31-8f20-caf35395868c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-ec6f-782d-bf89-279c6c78c630" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec6f-754f-9328-f10d3de0c8dd" xlink:to="loc_srt_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember_019ef4b5-ec6f-782d-bf89-279c6c78c630" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019ef5ab-bf79-770f-9645-e69a985388c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019ef5ab-bf79-770f-9645-e69a985388c6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-770f-9645-e69a985388c6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019ef5ab-bf79-770f-9645-e69a985388c6" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-770f-9645-e69a985388c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019ef5ab-bf79-770f-9645-e69a985388c6" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef5ab-bf79-7827-8b7f-449d00fa7b25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef5ab-bf79-7827-8b7f-449d00fa7b25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef5ac-b8db-787c-b3bf-913789811bc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef5ac-b8db-787c-b3bf-913789811bc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019ef5ad-1274-771a-b1f3-4b6257aa0ed2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019ef5ad-1274-771a-b1f3-4b6257aa0ed2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef5ad-e6ee-79b6-a378-ce38a8e91032" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef5ad-e6ee-79b6-a378-ce38a8e91032" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef5ae-2e3b-753f-b221-2f9e4eeaec91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef5ae-2e3b-753f-b221-2f9e4eeaec91" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef5b3-e0e2-734a-bfef-f3a30666c6eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef5b3-e0e2-734a-bfef-f3a30666c6eb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019ef5b4-bad4-7572-999c-cee4903c4f03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019ef5b4-bad4-7572-999c-cee4903c4f03" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtSecuritiesTradingMember_019ef5b5-998a-72a5-858a-50eda6ff98aa" xlink:href="ahl-20260630.xsd#ahl_DebtSecuritiesTradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_ahl_DebtSecuritiesTradingMember_019ef5b5-998a-72a5-858a-50eda6ff98aa" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019ef5b5-d469-7352-bea6-748c73ee8bce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_EquitySecuritiesMember_019ef5b5-d469-7352-bea6-748c73ee8bce" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019ef5b6-15df-759d-86c4-35a70bd0d0c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_LoansReceivableMember_019ef5b6-15df-759d-86c4-35a70bd0d0c7" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef5b6-5460-7340-bca4-6ab1276f708d" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_ahl_InvestmentFundsMember_019ef5b6-5460-7340-bca4-6ab1276f708d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundsWithheldatInterestMember_019ef5b6-8389-73e6-b615-12a673cd209f" xlink:href="ahl-20260630.xsd#ahl_FundsWithheldatInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_ahl_FundsWithheldatInterestMember_019ef5b6-8389-73e6-b615-12a673cd209f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019ef5b6-c648-7145-92a8-da030c3fc01f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFinancialInstrumentsAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019ef5b6-c648-7145-92a8-da030c3fc01f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019ef5b6-f642-738d-b84a-1c01e1670157" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019ef5b6-f642-738d-b84a-1c01e1670157" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentsOtherMember_019ef5ef-8ed4-7818-b470-c33d49356137" xlink:href="ahl-20260630.xsd#ahl_InvestmentsOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_ahl_InvestmentsOtherMember_019ef5ef-8ed4-7818-b470-c33d49356137" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableMember_019ef5b9-95ee-77ae-b570-b881d75f5744" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_ReinsuranceRecoverableMember_019ef5b9-95ee-77ae-b570-b881d75f5744" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_019ef5f8-6894-7188-a579-9ad7b3f68440" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_019ef5f8-6894-7188-a579-9ad7b3f68440" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtMember_019ef607-7421-7678-bd68-9261ab900d42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef5ab-bf79-7ca4-9224-d074f29e7c1c" xlink:to="loc_us-gaap_ForeignGovernmentDebtMember_019ef607-7421-7678-bd68-9261ab900d42" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019ef5bf-f262-7604-bc58-12e31836a6a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-eba1-746d-ad54-f35f4ef89766" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019ef5bf-f262-7604-bc58-12e31836a6a3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef5bf-f262-7604-bc58-12e31836a6a3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019ef5bf-f262-7604-bc58-12e31836a6a3" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef5bf-f262-7604-bc58-12e31836a6a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef5bf-f262-7b1e-8bc0-af30f5f2f003" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019ef5bf-f262-7604-bc58-12e31836a6a3" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef5bf-f262-7b1e-8bc0-af30f5f2f003" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractsMember_019ef5bf-f262-7687-a644-279acb6a8d49" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef5bf-f262-7b1e-8bc0-af30f5f2f003" xlink:to="loc_ahl_InterestSensitiveContractsMember_019ef5bf-f262-7687-a644-279acb6a8d49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FuturePolicyBenefitsMember_019ef5c0-671e-76d5-be24-b2b894ab09d4" xlink:href="ahl-20260630.xsd#ahl_FuturePolicyBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef5bf-f262-7b1e-8bc0-af30f5f2f003" xlink:to="loc_ahl_FuturePolicyBenefitsMember_019ef5c0-671e-76d5-be24-b2b894ab09d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_019ef5c0-c186-777c-b954-d7bccf14aeb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef5bf-f262-7b1e-8bc0-af30f5f2f003" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_019ef5c0-c186-777c-b954-d7bccf14aeb1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_LiabilitiesOtherMember_019ef5f2-d1dd-7152-90f0-4502e1a1464e" xlink:href="ahl-20260630.xsd#ahl_LiabilitiesOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef5bf-f262-7b1e-8bc0-af30f5f2f003" xlink:to="loc_ahl_LiabilitiesOtherMember_019ef5f2-d1dd-7152-90f0-4502e1a1464e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-ec6f-74f6-b909-2b3880e3bf40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-ec6f-74f6-b909-2b3880e3bf40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_019ef4b5-ec6f-7336-b49b-32b707ad836c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_TradingSecuritiesDebt_019ef4b5-ec6f-7336-b49b-32b707ad836c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_019ef4b5-ec6f-713e-ab23-632342fb299a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_019ef4b5-ec6f-713e-ab23-632342fb299a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-ec6f-7aad-b641-e459dbe3ac38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-ec6f-7aad-b641-e459dbe3ac38" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFunds_019ef4b5-ec6f-7360-8728-9a3856321dcb" xlink:href="ahl-20260630.xsd#ahl_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_ahl_InvestmentFunds_019ef4b5-ec6f-7360-8728-9a3856321dcb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsAsset_019ef4b5-ec6f-7745-aa73-34099ddc97ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FundsHeldUnderReinsuranceAgreementsAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsAsset_019ef4b5-ec6f-7745-aa73-34099ddc97ec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019ef4b5-ec6f-7980-ba88-0df33a171a2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_DerivativeAssets_019ef4b5-ec6f-7980-ba88-0df33a171a2b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019ef4b5-ec6f-7cdb-8e44-94794b44f428" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_ShortTermInvestments_019ef4b5-ec6f-7cdb-8e44-94794b44f428" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019ef4b5-ec6f-745f-aebb-275994964fd9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_OtherInvestments_019ef4b5-ec6f-745f-aebb-275994964fd9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019ef4b5-ec6f-7cdb-8120-638247243165" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019ef4b5-ec6f-7cdb-8120-638247243165" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019ef4b5-ec6f-77a7-8317-ad7a286f1793" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019ef4b5-ec6f-77a7-8317-ad7a286f1793" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_019ef4b5-ec6f-7f10-b257-76d7d08b8517" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_ReinsuranceRecoverables_019ef4b5-ec6f-7f10-b257-76d7d08b8517" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019ef4b5-ec6f-7217-ab76-7f8a59357a4c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_OtherAssets_019ef4b5-ec6f-7217-ab76-7f8a59357a4c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019ef4b5-ec6f-7df6-8a75-7fc6ab71ee51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019ef4b5-ec6f-72af-b6d8-4063c0f50772" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019ef4b5-ec6f-7df6-8a75-7fc6ab71ee51" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019ef4b5-ec6f-7ddc-bbc1-902f58b9e121" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019ef4b5-ec6f-7ddc-bbc1-902f58b9e121" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-ec6f-7544-bfc0-5968619cb68b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderContractDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019ef4b5-ec6f-7ddc-bbc1-902f58b9e121" xlink:to="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-ec6f-7544-bfc0-5968619cb68b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019ef4b5-ec6f-70e5-b925-6e9baaa05f60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019ef4b5-ec6f-7ddc-bbc1-902f58b9e121" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019ef4b5-ec6f-70e5-b925-6e9baaa05f60" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019ef4b5-ec6f-7377-a290-0c82cee14bce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019ef4b5-ec6f-7ddc-bbc1-902f58b9e121" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019ef4b5-ec6f-7377-a290-0c82cee14bce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019ef4b5-ec6f-7200-a043-d92925cb5e56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019ef4b5-ec6f-7ddc-bbc1-902f58b9e121" xlink:to="loc_us-gaap_DerivativeLiabilities_019ef4b5-ec6f-7200-a043-d92925cb5e56" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherLiabilitiesNet_019ef4b5-ec6f-7835-aa84-94b79c619fee" xlink:href="ahl-20260630.xsd#ahl_OtherLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019ef4b5-ec6f-7ddc-bbc1-902f58b9e121" xlink:to="loc_ahl_OtherLiabilitiesNet_019ef4b5-ec6f-7835-aa84-94b79c619fee" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019ef4b5-ec6f-7d88-acff-a809837835a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019ef4b5-ec6f-7ddc-bbc1-902f58b9e121" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019ef4b5-ec6f-7d88-acff-a809837835a4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019ef5ab-bf79-7270-9b5f-1f6a50037108" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019ef5ab-bf79-7270-9b5f-1f6a50037108" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019ef5bc-2ff9-70d4-83de-f13e1b40b722" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019ef5bc-2ff9-70d4-83de-f13e1b40b722" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019ef5bc-8769-716d-a2af-d3aa55f4e8c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019ef5bc-8769-716d-a2af-d3aa55f4e8c7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_019ef5bc-c3a6-7cec-ba26-99d9d0da6a28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_019ef5bc-c3a6-7cec-ba26-99d9d0da6a28" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019ef5bc-f784-7c97-8459-848062a208a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019ef5bc-f784-7c97-8459-848062a208a2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019ef5bd-60f9-7027-9054-6f78d30acefa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019ef5bd-60f9-7027-9054-6f78d30acefa" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci_019ef5bd-a7fb-7f97-9430-cafa3dbbd75e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci_019ef5bd-a7fb-7f97-9430-cafa3dbbd75e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019ef5be-c127-7152-b3c3-0f2e5eff7a94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019ef5be-c127-7152-b3c3-0f2e5eff7a94" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019ef5be-f717-74d6-a4bb-eb05f707f4b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019ef5be-f717-74d6-a4bb-eb05f707f4b9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements_019ef5bf-68ba-712e-ba1f-40eae3b53f10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements_019ef5bf-68ba-712e-ba1f-40eae3b53f10" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019ef5bf-a167-7caf-adae-b88e7504415a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019ef5bf-a167-7caf-adae-b88e7504415a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019ef5bf-f262-7b1f-ade4-71126d7ff277" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019ef5bf-f262-7b1f-ade4-71126d7ff277" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019ef5c1-4a7f-7b1a-a326-705937ce1d79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019ef5c1-4a7f-7b1a-a326-705937ce1d79" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci_019ef5c1-9609-7191-a6da-a15b13ba8edb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci_019ef5c1-9609-7191-a6da-a15b13ba8edb" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019ef5ff-7954-75b3-af68-616488b23239" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019ef5ff-7954-75b3-af68-616488b23239" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_019ef5ff-7954-76a8-9305-3c9ece3d2130" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_019ef5ff-7954-76a8-9305-3c9ece3d2130" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019ef5ff-7954-7805-996f-5c25109c80ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019ef5ff-7954-7805-996f-5c25109c80ff" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019ef5ff-7954-780f-8cd4-aee2066a9615" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019ef5ff-7954-780f-8cd4-aee2066a9615" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019ef5ff-7954-75ce-a75c-8bdea5483b65" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019ef5ff-7954-75ce-a75c-8bdea5483b65" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019ef5ff-7954-7912-8155-42aec55d6e91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019ef5ff-7954-7912-8155-42aec55d6e91" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019ef61e-c61b-74f6-89dd-9dc3f663cccd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019ef61e-c61b-74f6-89dd-9dc3f663cccd" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_019ef61e-c61b-7678-9cc6-cd5722905763" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_019ef61e-c61b-7678-9cc6-cd5722905763" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019ef61e-c61b-7ffe-971a-7c4aa344a302" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019ef61e-c61b-7ffe-971a-7c4aa344a302" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019ef61e-c61b-7999-bfb2-c87168f6c08b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019ef61e-c61b-7999-bfb2-c87168f6c08b" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019ef61e-c61b-76a2-89a7-f98e99201b33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019ef61e-c61b-76a2-89a7-f98e99201b33" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019ef61e-c61b-7577-9451-f731034cacb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec6f-74da-8fbe-ccc8251705ad" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019ef61e-c61b-7577-9451-f731034cacb1" xlink:type="arc" order="27"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/FairValueFairValueOptionDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#FairValueFairValueOptionDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/FairValueFairValueOptionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019ef4b5-ec6f-7974-9422-876774876fca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019ef4b5-ec6f-7974-9422-876774876fca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019ef4b5-ec6f-70e6-9c1f-44e5b95edadb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019ef4b5-ec6f-7974-9422-876774876fca" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019ef4b5-ec6f-70e6-9c1f-44e5b95edadb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019ef4b5-ec6f-7974-9422-876774876fca" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019ef4b5-ec6f-76d5-b4ef-0ab9e6f1ad44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_LoansReceivableMember_019ef4b5-ec6f-76d5-b4ef-0ab9e6f1ad44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec6f-75b4-b151-d6094fb932cc" xlink:href="ahl-20260630.xsd#ahl_DebtSecuritiesTradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec6f-75b4-b151-d6094fb932cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec6f-7c7f-b5ce-465849e73cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec6f-7c7f-b5ce-465849e73cdc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-ec6f-7bad-aef8-365ef1070ab6" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-ec6f-7bad-aef8-365ef1070ab6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceContractRightsAndObligationsFairValueOptionMember_019ef4b5-ec6f-75f3-8871-f196c7c4d795" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InsuranceContractRightsAndObligationsFairValueOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_InsuranceContractRightsAndObligationsFairValueOptionMember_019ef4b5-ec6f-75f3-8871-f196c7c4d795" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_019ef4b5-ec6f-742b-bc4c-a041cc8a62e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_ResidentialMortgageMember_019ef4b5-ec6f-742b-bc4c-a041cc8a62e1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionOtherEligibleItemsMember_019ef4b5-ec6f-7110-a06f-d7cb3cd131ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionOtherEligibleItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_FairValueOptionOtherEligibleItemsMember_019ef4b5-ec6f-7110-a06f-d7cb3cd131ec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_019ef4b5-ec6f-775b-8a77-5d93cdc87b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_019ef4b5-ec6f-775b-8a77-5d93cdc87b8c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019ef4b5-ec6f-7974-9422-876774876fca" xlink:to="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734" xlink:to="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain_019ef4b5-ec6f-75d7-ae22-e38addcf0fee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734" xlink:to="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain_019ef4b5-ec6f-75d7-ae22-e38addcf0fee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsuredOrGuaranteedByUsGovernmentAuthoritiesMember_019ef4b5-ec6f-7e56-b34c-d02ca5ce9476" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansInsuredOrGuaranteedByUsGovernmentAuthoritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain_019ef4b5-ec6f-75d7-ae22-e38addcf0fee" xlink:to="loc_us-gaap_LoansInsuredOrGuaranteedByUsGovernmentAuthoritiesMember_019ef4b5-ec6f-7e56-b34c-d02ca5ce9476" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue_019ef4b5-ec6f-71a6-a7c0-ab2fed600f30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue_019ef4b5-ec6f-71a6-a7c0-ab2fed600f30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatus_019ef4b5-ec6f-7268-8af8-b373dbb0dc70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatus_019ef4b5-ec6f-7268-8af8-b373dbb0dc70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionChangesInFairValueGainLoss1_019ef4b5-ec6f-76f1-a18d-179cc94f578f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionChangesInFairValueGainLoss1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionChangesInFairValueGainLoss1_019ef4b5-ec6f-76f1-a18d-179cc94f578f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FairValueOptionUnpaidPrincipalBalanceAssets_019ef4b5-ec6f-7ee9-8bca-014c0c0c6df9" xlink:href="ahl-20260630.xsd#ahl_FairValueOptionUnpaidPrincipalBalanceAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_ahl_FairValueOptionUnpaidPrincipalBalanceAssets_019ef4b5-ec6f-7ee9-8bca-014c0c0c6df9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables_019ef4b5-ec6f-7ab4-aa9d-135bc3e99480" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables_019ef4b5-ec6f-7ab4-aa9d-135bc3e99480" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FairValueOptionFairValueCarryingAmountAssets_019ef4b5-ec6f-705f-bc07-afb6bdc00dae" xlink:href="ahl-20260630.xsd#ahl_FairValueOptionFairValueCarryingAmountAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_ahl_FairValueOptionFairValueCarryingAmountAssets_019ef4b5-ec6f-705f-bc07-afb6bdc00dae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets_019ef4b5-ec6f-7061-acad-e7b27191870f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets_019ef4b5-ec6f-7061-acad-e7b27191870f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateDifference_019ef4b5-ec6f-73cf-a396-c6e8c75b748c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionLoansHeldAsAssetsAggregateDifference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateDifference_019ef4b5-ec6f-73cf-a396-c6e8c75b748c" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/FairValueFairValueOptionDetails_1" xlink:type="simple" xlink:href="ahl-20260630.xsd#FairValueFairValueOptionDetails_1"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/FairValueFairValueOptionDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019ef4b5-ec6f-7974-9422-876774876fca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019ef4b5-ec6f-7974-9422-876774876fca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019ef4b5-ec6f-7974-9422-876774876fca" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7229-b4ff-e6eb855cfa0d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019ef4b5-ec6f-76d5-b4ef-0ab9e6f1ad44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_LoansReceivableMember_019ef4b5-ec6f-76d5-b4ef-0ab9e6f1ad44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec6f-75b4-b151-d6094fb932cc" xlink:href="ahl-20260630.xsd#ahl_DebtSecuritiesTradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec6f-75b4-b151-d6094fb932cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec6f-7c7f-b5ce-465849e73cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec6f-7c7f-b5ce-465849e73cdc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-ec6f-7bad-aef8-365ef1070ab6" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-ec6f-7bad-aef8-365ef1070ab6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceContractRightsAndObligationsFairValueOptionMember_019ef4b5-ec6f-75f3-8871-f196c7c4d795" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InsuranceContractRightsAndObligationsFairValueOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_InsuranceContractRightsAndObligationsFairValueOptionMember_019ef4b5-ec6f-75f3-8871-f196c7c4d795" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_019ef4b5-ec6f-742b-bc4c-a041cc8a62e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_ResidentialMortgageMember_019ef4b5-ec6f-742b-bc4c-a041cc8a62e1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionOtherEligibleItemsMember_019ef4b5-ec6f-7110-a06f-d7cb3cd131ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionOtherEligibleItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_FairValueOptionOtherEligibleItemsMember_019ef4b5-ec6f-7110-a06f-d7cb3cd131ec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_019ef4b5-ec6f-775b-8a77-5d93cdc87b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-735d-ad88-26749f7aea55" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_019ef4b5-ec6f-775b-8a77-5d93cdc87b8c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019ef4b5-ec6f-7974-9422-876774876fca" xlink:to="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734" xlink:to="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain_019ef4b5-ec6f-75d7-ae22-e38addcf0fee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis_019ef4b5-ec6f-7dc9-b62c-0dadd42d3734" xlink:to="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain_019ef4b5-ec6f-75d7-ae22-e38addcf0fee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsuredOrGuaranteedByUsGovernmentAuthoritiesMember_019ef4b5-ec6f-7e56-b34c-d02ca5ce9476" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansInsuredOrGuaranteedByUsGovernmentAuthoritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesDomain_019ef4b5-ec6f-75d7-ae22-e38addcf0fee" xlink:to="loc_us-gaap_LoansInsuredOrGuaranteedByUsGovernmentAuthoritiesMember_019ef4b5-ec6f-7e56-b34c-d02ca5ce9476" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue_019ef4b5-ec6f-71a6-a7c0-ab2fed600f30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue_019ef4b5-ec6f-71a6-a7c0-ab2fed600f30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatus_019ef4b5-ec6f-7268-8af8-b373dbb0dc70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateAmountInNonaccrualStatus_019ef4b5-ec6f-7268-8af8-b373dbb0dc70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionChangesInFairValueGainLoss1_019ef4b5-ec6f-76f1-a18d-179cc94f578f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionChangesInFairValueGainLoss1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionChangesInFairValueGainLoss1_019ef4b5-ec6f-76f1-a18d-179cc94f578f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FairValueOptionUnpaidPrincipalBalanceAssets_019ef4b5-ec6f-7ee9-8bca-014c0c0c6df9" xlink:href="ahl-20260630.xsd#ahl_FairValueOptionUnpaidPrincipalBalanceAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_ahl_FairValueOptionUnpaidPrincipalBalanceAssets_019ef4b5-ec6f-7ee9-8bca-014c0c0c6df9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables_019ef4b5-ec6f-7ab4-aa9d-135bc3e99480" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables_019ef4b5-ec6f-7ab4-aa9d-135bc3e99480" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FairValueOptionFairValueCarryingAmountAssets_019ef4b5-ec6f-705f-bc07-afb6bdc00dae" xlink:href="ahl-20260630.xsd#ahl_FairValueOptionFairValueCarryingAmountAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_ahl_FairValueOptionFairValueCarryingAmountAssets_019ef4b5-ec6f-705f-bc07-afb6bdc00dae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets_019ef4b5-ec6f-7061-acad-e7b27191870f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets_019ef4b5-ec6f-7061-acad-e7b27191870f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateDifference_019ef4b5-ec6f-73cf-a396-c6e8c75b748c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionLoansHeldAsAssetsAggregateDifference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019ef4b5-ec6f-70f3-b6dd-361e7edeea3d" xlink:to="loc_us-gaap_FairValueOptionLoansHeldAsAssetsAggregateDifference_019ef4b5-ec6f-73cf-a396-c6e8c75b748c" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/FairValueReconciliationofLevel3FinancialInstrumentsDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#FairValueReconciliationofLevel3FinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/FairValueReconciliationofLevel3FinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec70-7017-922e-a5661e54fa9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-ec6f-7f68-9861-dd2d92cc9f84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec70-7017-922e-a5661e54fa9e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-ec6f-7f68-9861-dd2d92cc9f84" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7fde-b24e-f6511a70ccac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-ec6f-7f68-9861-dd2d92cc9f84" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7fde-b24e-f6511a70ccac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7fde-b24e-f6511a70ccac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7fde-b24e-f6511a70ccac" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7fde-b24e-f6511a70ccac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7f87-ac05-3237459adcab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec6f-7fde-b24e-f6511a70ccac" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7f87-ac05-3237459adcab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-ec6f-72eb-aa6b-ae56c60131c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7f87-ac05-3237459adcab" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-ec6f-72eb-aa6b-ae56c60131c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-ec6f-7ed4-b4ae-5832ade7fae0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7f87-ac05-3237459adcab" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-ec6f-7ed4-b4ae-5832ade7fae0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-ec6f-7840-a96b-cc03d86fd5a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7f87-ac05-3237459adcab" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-ec6f-7840-a96b-cc03d86fd5a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-ec70-71e8-8e03-e611d21b5091" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7f87-ac05-3237459adcab" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-ec70-71e8-8e03-e611d21b5091" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec70-7de3-9374-0e098b6051d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7f87-ac05-3237459adcab" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec70-7de3-9374-0e098b6051d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-ec70-73da-97ea-ce787467629b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7f87-ac05-3237459adcab" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-ec70-73da-97ea-ce787467629b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-ec70-79c6-82cc-ce964af5d801" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec6f-7f87-ac05-3237459adcab" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-ec70-79c6-82cc-ce964af5d801" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-ec70-70ba-8dd5-8e5179bb56db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-ec6f-7f68-9861-dd2d92cc9f84" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-ec70-70ba-8dd5-8e5179bb56db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-70ba-8dd5-8e5179bb56db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-ec70-70ba-8dd5-8e5179bb56db" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-70ba-8dd5-8e5179bb56db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-ec70-70ba-8dd5-8e5179bb56db" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-ec70-7581-a6cd-37d5485d4b14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-ec70-7581-a6cd-37d5485d4b14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec70-7c63-a5d4-c6a56b19a36a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec70-7c63-a5d4-c6a56b19a36a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-ec70-7b23-b7b8-85c1a278c768" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-ec70-7b23-b7b8-85c1a278c768" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-ec70-71e1-9b14-cca82c1782eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-ec70-71e1-9b14-cca82c1782eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-ec70-7240-bff5-6f4007552bb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-ec70-7240-bff5-6f4007552bb1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec70-7a46-a1c6-a5d642805f77" xlink:href="ahl-20260630.xsd#ahl_DebtSecuritiesTradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec70-7a46-a1c6-a5d642805f77" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec70-7e42-85ab-433a658b5d6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec70-7e42-85ab-433a658b5d6d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019ef4b5-ec70-74ed-bd6c-2022f2094464" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_LoansReceivableMember_019ef4b5-ec70-74ed-bd6c-2022f2094464" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundsWithheldatInterestMember_019ef4b5-ec70-70e9-86b4-e1e4e22c9c55" xlink:href="ahl-20260630.xsd#ahl_FundsWithheldatInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_ahl_FundsWithheldatInterestMember_019ef4b5-ec70-70e9-86b4-e1e4e22c9c55" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019ef4b5-ec70-7cca-9124-d1c06ff57810" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFinancialInstrumentsAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019ef4b5-ec70-7cca-9124-d1c06ff57810" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019ef4b5-ec70-79b8-83c9-c373e2977bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019ef4b5-ec70-79b8-83c9-c373e2977bdb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentsOtherMember_019ef5fc-0fd2-7fe8-947e-60db61e7f89a" xlink:href="ahl-20260630.xsd#ahl_InvestmentsOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_ahl_InvestmentsOtherMember_019ef5fc-0fd2-7fe8-947e-60db61e7f89a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-ec70-7d4f-bac2-e14f7fa3f1a6" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-ec70-7d4f-bac2-e14f7fa3f1a6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedLoanObligationsMember_019ef4b5-ec70-713b-9531-70cc8d641fca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedLoanObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_CollateralizedLoanObligationsMember_019ef4b5-ec70-713b-9531-70cc8d641fca" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableMember_019ef4b5-ec70-7be8-9ab9-c3366d10e8de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_ReinsuranceRecoverableMember_019ef4b5-ec70-7be8-9ab9-c3366d10e8de" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-ec70-7fcb-8ddb-d49497aaa1b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-ec70-7fcb-8ddb-d49497aaa1b6" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtMember_019ef4b5-ec70-7195-a09c-f836e8ab6392" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_ForeignGovernmentDebtMember_019ef4b5-ec70-7195-a09c-f836e8ab6392" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeMember_019ef4b5-ec70-797e-b205-f97b4beb9f50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7faf-9107-acaa3ebfb743" xlink:to="loc_us-gaap_DerivativeMember_019ef4b5-ec70-797e-b205-f97b4beb9f50" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7451-9b19-c5a2cac22f22" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-ec6f-7f68-9861-dd2d92cc9f84" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7451-9b19-c5a2cac22f22" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7451-9b19-c5a2cac22f22_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7451-9b19-c5a2cac22f22" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7451-9b19-c5a2cac22f22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7e11-854f-3c33f5391ede" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7451-9b19-c5a2cac22f22" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7e11-854f-3c33f5391ede" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019ef4b5-ec70-7576-954a-62a78b5010bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7e11-854f-3c33f5391ede" xlink:to="loc_us-gaap_UniversalLifeMember_019ef4b5-ec70-7576-954a-62a78b5010bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AmerUsClosedBlockMember_019ef4b5-ec70-7463-92a7-21cc6bceed60" xlink:href="ahl-20260630.xsd#ahl_AmerUsClosedBlockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7e11-854f-3c33f5391ede" xlink:to="loc_ahl_AmerUsClosedBlockMember_019ef4b5-ec70-7463-92a7-21cc6bceed60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_IndianapolisLifeInsuranceCompanyClosedBlockMember_019ef4b5-ec70-7606-aff2-df7f9fd32e40" xlink:href="ahl-20260630.xsd#ahl_IndianapolisLifeInsuranceCompanyClosedBlockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7e11-854f-3c33f5391ede" xlink:to="loc_ahl_IndianapolisLifeInsuranceCompanyClosedBlockMember_019ef4b5-ec70-7606-aff2-df7f9fd32e40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-7524-a262-656d427e2900" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-ec6f-7f68-9861-dd2d92cc9f84" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-7524-a262-656d427e2900" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-7524-a262-656d427e2900_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-7524-a262-656d427e2900" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-7524-a262-656d427e2900_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-708d-b56e-2262a575efb8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-7524-a262-656d427e2900" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-708d-b56e-2262a575efb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_019ef4b5-ec70-7224-a877-835d189dc5c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-708d-b56e-2262a575efb8" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_019ef4b5-ec70-7224-a877-835d189dc5c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractsMember_019ef4b5-ec70-7b2f-ad08-a15557da4734" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_019ef4b5-ec70-7224-a877-835d189dc5c2" xlink:to="loc_ahl_InterestSensitiveContractsMember_019ef4b5-ec70-7b2f-ad08-a15557da4734" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FuturePolicyBenefitsMember_019ef4b5-ec70-73dd-8ef3-f48d26de420d" xlink:href="ahl-20260630.xsd#ahl_FuturePolicyBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_019ef4b5-ec70-7224-a877-835d189dc5c2" xlink:to="loc_ahl_FuturePolicyBenefitsMember_019ef4b5-ec70-73dd-8ef3-f48d26de420d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_LiabilitiesOtherMember_019ef5fd-490e-7fd2-bb5a-af12eaaba46e" xlink:href="ahl-20260630.xsd#ahl_LiabilitiesOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-708d-b56e-2262a575efb8" xlink:to="loc_ahl_LiabilitiesOtherMember_019ef5fd-490e-7fd2-bb5a-af12eaaba46e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-78e0-802d-639b222ccc18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-ec6f-7f68-9861-dd2d92cc9f84" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-78e0-802d-639b222ccc18" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-78e0-802d-639b222ccc18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-78e0-802d-639b222ccc18" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-78e0-802d-639b222ccc18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-7bc4-8dbe-0427d8a71e0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-78e0-802d-639b222ccc18" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-7bc4-8dbe-0427d8a71e0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-ec70-7498-96b6-d8fcc6c8e637" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-7bc4-8dbe-0427d8a71e0b" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-ec70-7498-96b6-d8fcc6c8e637" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-7fc3-959d-68c4b8836708" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-ec6f-7f68-9861-dd2d92cc9f84" xlink:to="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-7fc3-959d-68c4b8836708" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-7fc3-959d-68c4b8836708_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-7fc3-959d-68c4b8836708" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-7fc3-959d-68c4b8836708_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-710d-93f0-f23737934234" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-7fc3-959d-68c4b8836708" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-710d-93f0-f23737934234" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec70-7f6b-a276-944a1abe4f54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-710d-93f0-f23737934234" xlink:to="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec70-7f6b-a276-944a1abe4f54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec70-7333-b62e-9b90806e3aed" xlink:href="ahl-20260630.xsd#ahl_DebtSecuritiesTradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-710d-93f0-f23737934234" xlink:to="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec70-7333-b62e-9b90806e3aed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-ec70-731c-ba26-89489b4b5995" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-710d-93f0-f23737934234" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-ec70-731c-ba26-89489b4b5995" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7916-a4bb-d8a16a3e5b2a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ef4b5-ec6f-7f68-9861-dd2d92cc9f84" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7916-a4bb-d8a16a3e5b2a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7916-a4bb-d8a16a3e5b2a_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7916-a4bb-d8a16a3e5b2a" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7916-a4bb-d8a16a3e5b2a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7944-a3fd-421345f12274" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7916-a4bb-d8a16a3e5b2a" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7944-a3fd-421345f12274" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-ec70-7878-b704-38dd3a08e065" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7944-a3fd-421345f12274" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-ec70-7878-b704-38dd3a08e065" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-7eb9-aa79-2640acf8c064" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7944-a3fd-421345f12274" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-7eb9-aa79-2640acf8c064" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-ec70-7c8b-882c-ef936976bf94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7944-a3fd-421345f12274" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-ec70-7c8b-882c-ef936976bf94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingVariableInterestEntitiesVIEandInvestmentsinRelatedPartyMember_019ef4b5-ec70-7b80-8362-2cc1e3d99dde" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingVariableInterestEntitiesVIEandInvestmentsinRelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7944-a3fd-421345f12274" xlink:to="loc_ahl_ConsolidatedEntityExcludingVariableInterestEntitiesVIEandInvestmentsinRelatedPartyMember_019ef4b5-ec70-7b80-8362-2cc1e3d99dde" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-74a7-97d9-468821b2cf6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec70-7017-922e-a5661e54fa9e" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-74a7-97d9-468821b2cf6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019ef4b5-ec70-7f0d-a9aa-4d6fa0f33eb2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-74a7-97d9-468821b2cf6e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019ef4b5-ec70-7f0d-a9aa-4d6fa0f33eb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019ef4b5-ec70-7731-b8a0-ceaf73b32b69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-74a7-97d9-468821b2cf6e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019ef4b5-ec70-7731-b8a0-ceaf73b32b69" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019ef4b5-ec70-79de-af21-164719387617" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-74a7-97d9-468821b2cf6e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019ef4b5-ec70-79de-af21-164719387617" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_019ef4b5-ec70-77c1-9903-6d016e972930" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-74a7-97d9-468821b2cf6e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_019ef4b5-ec70-77c1-9903-6d016e972930" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019ef4b5-ec70-7123-8374-2768bbf1aca1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-74a7-97d9-468821b2cf6e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019ef4b5-ec70-7123-8374-2768bbf1aca1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019ef4b5-ec70-7281-bd8b-3f0d5c4158a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-74a7-97d9-468821b2cf6e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019ef4b5-ec70-7281-bd8b-3f0d5c4158a8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019ef4b5-ec70-7c4a-a260-601ecbc5288a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019ef4b5-ec70-747c-8634-95c63961c31f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec70-7017-922e-a5661e54fa9e" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019ef4b5-ec70-747c-8634-95c63961c31f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci_019ef4b5-ec70-787c-8349-7141aa327e46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec70-7017-922e-a5661e54fa9e" xlink:to="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci_019ef4b5-ec70-787c-8349-7141aa327e46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec70-7017-922e-a5661e54fa9e" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019ef4b5-ec70-7e83-b33e-eab240b7c079" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019ef4b5-ec70-7e83-b33e-eab240b7c079" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019ef4b5-ec70-7b06-aba5-8b758ca891fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019ef4b5-ec70-7b06-aba5-8b758ca891fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019ef4b5-ec70-7b5c-9655-91b7a5eda98f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019ef4b5-ec70-7b5c-9655-91b7a5eda98f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements_019ef4b5-ec70-75e6-925d-dad19b9ced54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements_019ef4b5-ec70-75e6-925d-dad19b9ced54" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019ef4b5-ec70-782d-aeed-32cb2f871a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019ef4b5-ec70-782d-aeed-32cb2f871a2a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019ef4b5-ec70-7359-91c2-e974c2ca556f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019ef4b5-ec70-7359-91c2-e974c2ca556f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019ef4b5-ec70-738b-9df2-b619bf617722" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019ef4b5-ec70-738b-9df2-b619bf617722" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019ef4b5-ec70-766b-b3ca-d0a4e84d7601" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019ef4b5-ec70-766b-b3ca-d0a4e84d7601" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_019ef4b5-ec70-7efe-b69a-d9b20fbbc61e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_019ef4b5-ec70-7efe-b69a-d9b20fbbc61e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019ef4b5-ec70-7da6-94d2-fcfd04507b53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019ef4b5-ec70-7da6-94d2-fcfd04507b53" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019ef4b5-ec70-7b5a-897e-4cfb3f0113de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019ef4b5-ec70-7b5a-897e-4cfb3f0113de" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019ef4b5-ec70-72ef-9e1c-bf4c09e72ced" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019ef4b5-ec70-7b16-b9b6-ac666976a42e" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019ef4b5-ec70-72ef-9e1c-bf4c09e72ced" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019ef4b5-ec70-7997-991b-fec66d316418" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019ef4b5-ec70-7ab1-b4e8-2d4f6f2c1f60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec70-7017-922e-a5661e54fa9e" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_019ef4b5-ec70-7ab1-b4e8-2d4f6f2c1f60" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci_019ef4b5-ec70-7083-ad2a-e392d7c50428" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ef4b5-ec70-7017-922e-a5661e54fa9e" xlink:to="loc_us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci_019ef4b5-ec70-7083-ad2a-e392d7c50428" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/FairValueGrossComponentsofPurchasesSalesIssuancesandSettlementsnetDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#FairValueGrossComponentsofPurchasesSalesIssuancesandSettlementsnetDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/FairValueGrossComponentsofPurchasesSalesIssuancesandSettlementsnetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:href="ahl-20260630.xsd#ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTable_019ef4b5-ec70-7e63-82a4-a241ac6b86f9" xlink:href="ahl-20260630.xsd#ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTable_019ef4b5-ec70-7e63-82a4-a241ac6b86f9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-782f-a789-a6824293804b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTable_019ef4b5-ec70-7e63-82a4-a241ac6b86f9" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-782f-a789-a6824293804b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-782f-a789-a6824293804b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-782f-a789-a6824293804b" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-782f-a789-a6824293804b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-7f09-b8fb-c4718f6ea547" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-782f-a789-a6824293804b" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-7f09-b8fb-c4718f6ea547" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractsMember_019ef4b5-ec70-7f8b-b3e8-5ef56f0d16a4" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-7f09-b8fb-c4718f6ea547" xlink:to="loc_ahl_InterestSensitiveContractsMember_019ef4b5-ec70-7f8b-b3e8-5ef56f0d16a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_019ef4b5-ec70-7afa-8e89-ec59685deed0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-7f09-b8fb-c4718f6ea547" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember_019ef4b5-ec70-7afa-8e89-ec59685deed0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FuturePolicyBenefitsMember_019ef4b5-ec70-76c6-908b-7dfab6390f70" xlink:href="ahl-20260630.xsd#ahl_FuturePolicyBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-7f09-b8fb-c4718f6ea547" xlink:to="loc_ahl_FuturePolicyBenefitsMember_019ef4b5-ec70-76c6-908b-7dfab6390f70" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_LiabilitiesOtherMember_019ef603-a92d-7c90-af07-630ece8a9bd7" xlink:href="ahl-20260630.xsd#ahl_LiabilitiesOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-7f09-b8fb-c4718f6ea547" xlink:to="loc_ahl_LiabilitiesOtherMember_019ef603-a92d-7c90-af07-630ece8a9bd7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-7ce1-9dcf-720bfd5edc2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTable_019ef4b5-ec70-7e63-82a4-a241ac6b86f9" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-7ce1-9dcf-720bfd5edc2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-7ce1-9dcf-720bfd5edc2f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-7ce1-9dcf-720bfd5edc2f" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-7ce1-9dcf-720bfd5edc2f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-798a-81d7-0f19e3ee99ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-7ce1-9dcf-720bfd5edc2f" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-798a-81d7-0f19e3ee99ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-ec70-7f6a-8706-14500cf64f99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-798a-81d7-0f19e3ee99ea" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-ec70-7f6a-8706-14500cf64f99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-ec70-7746-9979-d257b37f80c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTable_019ef4b5-ec70-7e63-82a4-a241ac6b86f9" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-ec70-7746-9979-d257b37f80c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7746-9979-d257b37f80c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-ec70-7746-9979-d257b37f80c0" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-7746-9979-d257b37f80c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_019ef4b5-ec70-7746-9979-d257b37f80c0" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-ec70-7e56-92f3-fc5ccf14da86" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-ec70-7e56-92f3-fc5ccf14da86" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec70-74bf-9bed-c8c6c9212536" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec70-74bf-9bed-c8c6c9212536" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-ec70-7cbf-9728-3fe15a544abf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-ec70-7cbf-9728-3fe15a544abf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-ec70-75f6-8d33-74f044da32ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-ec70-75f6-8d33-74f044da32ba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-ec70-73de-9c0d-bc92c064d5d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-ec70-73de-9c0d-bc92c064d5d6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec70-7811-ac9f-b93ff9b99449" xlink:href="ahl-20260630.xsd#ahl_DebtSecuritiesTradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec70-7811-ac9f-b93ff9b99449" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec70-7492-ad9c-d76d14734bf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec70-7492-ad9c-d76d14734bf6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundsWithheldatInterestMember_019ef4b5-ec70-78fd-a95d-0e3276e6cf2f" xlink:href="ahl-20260630.xsd#ahl_FundsWithheldatInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_ahl_FundsWithheldatInterestMember_019ef4b5-ec70-78fd-a95d-0e3276e6cf2f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019ef4b5-ec70-7468-a755-6578199f783c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFinancialInstrumentsAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019ef4b5-ec70-7468-a755-6578199f783c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019ef4b5-ec70-73e6-bccf-a01cf83edfc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_LoansReceivableMember_019ef4b5-ec70-73e6-bccf-a01cf83edfc5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019ef4b5-ec70-7c35-9208-0d2ced61872f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019ef4b5-ec70-7c35-9208-0d2ced61872f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-ec70-7909-8547-6aacded95a59" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-ec70-7909-8547-6aacded95a59" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverableMember_019ef4b5-ec70-7f6b-a2f8-a21bcff24c22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_ReinsuranceRecoverableMember_019ef4b5-ec70-7f6b-a2f8-a21bcff24c22" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentsOtherMember_019ef602-4974-7917-9b4c-5b98f4146148" xlink:href="ahl-20260630.xsd#ahl_InvestmentsOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_ahl_InvestmentsOtherMember_019ef602-4974-7917-9b4c-5b98f4146148" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-ec70-71f6-b8a5-cdf26fc2c041" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-ec70-71f6-b8a5-cdf26fc2c041" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-ec70-7e67-beea-d0fdbeef971e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-ec70-7e67-beea-d0fdbeef971e" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtMember_019ef4b5-ec70-74ff-abed-6927d1f21696" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_019ef4b5-ec70-79d5-810a-c35d361c7aa8" xlink:to="loc_us-gaap_ForeignGovernmentDebtMember_019ef4b5-ec70-74ff-abed-6927d1f21696" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec70-7da0-8ce5-b6770c75f12e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTable_019ef4b5-ec70-7e63-82a4-a241ac6b86f9" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec70-7da0-8ce5-b6770c75f12e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-7da0-8ce5-b6770c75f12e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec70-7da0-8ce5-b6770c75f12e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-7da0-8ce5-b6770c75f12e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-77aa-b6b7-38585edf36d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec70-7da0-8ce5-b6770c75f12e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-77aa-b6b7-38585edf36d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-ec70-739b-9a2c-30bfe0729e09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-77aa-b6b7-38585edf36d2" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019ef4b5-ec70-739b-9a2c-30bfe0729e09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-ec70-77dc-9e81-a530ba66b2d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-77aa-b6b7-38585edf36d2" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019ef4b5-ec70-77dc-9e81-a530ba66b2d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec70-7803-a6d6-1efc46f82755" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-77aa-b6b7-38585edf36d2" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec70-7803-a6d6-1efc46f82755" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-ec70-706a-89f2-038a9a59ef3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedDebtObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-77aa-b6b7-38585edf36d2" xlink:to="loc_us-gaap_CollateralizedDebtObligationsMember_019ef4b5-ec70-706a-89f2-038a9a59ef3f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-ec70-76e0-a375-8555b580e5f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-77aa-b6b7-38585edf36d2" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019ef4b5-ec70-76e0-a375-8555b580e5f5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-ec70-7951-b367-8b1511d8e9a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-77aa-b6b7-38585edf36d2" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019ef4b5-ec70-7951-b367-8b1511d8e9a1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-ec70-71ce-a8e1-ea4e15e459fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-77aa-b6b7-38585edf36d2" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019ef4b5-ec70-71ce-a8e1-ea4e15e459fd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-72ff-8e2d-604bb45b5574" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTable_019ef4b5-ec70-7e63-82a4-a241ac6b86f9" xlink:to="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-72ff-8e2d-604bb45b5574" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-72ff-8e2d-604bb45b5574_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-72ff-8e2d-604bb45b5574" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-72ff-8e2d-604bb45b5574_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-735c-92e7-2711946545f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-72ff-8e2d-604bb45b5574" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-735c-92e7-2711946545f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019ef4b5-ec70-7a72-9757-f28cb6b6d539" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-735c-92e7-2711946545f5" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019ef4b5-ec70-7a72-9757-f28cb6b6d539" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec70-7981-8d96-279ef3e69c4e" xlink:href="ahl-20260630.xsd#ahl_DebtSecuritiesTradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-735c-92e7-2711946545f5" xlink:to="loc_ahl_DebtSecuritiesTradingMember_019ef4b5-ec70-7981-8d96-279ef3e69c4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec70-7de4-a553-60293f515e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-735c-92e7-2711946545f5" xlink:to="loc_us-gaap_EquitySecuritiesMember_019ef4b5-ec70-7de4-a553-60293f515e9f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-ec70-768a-8933-916dcb229d80" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-735c-92e7-2711946545f5" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-ec70-768a-8933-916dcb229d80" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableMember_019ef4b5-ec70-7984-806c-5e221b529f87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-735c-92e7-2711946545f5" xlink:to="loc_us-gaap_LoansReceivableMember_019ef4b5-ec70-7984-806c-5e221b529f87" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7a40-b391-f6703a6f1b68" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTable_019ef4b5-ec70-7e63-82a4-a241ac6b86f9" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7a40-b391-f6703a6f1b68" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7a40-b391-f6703a6f1b68_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7a40-b391-f6703a6f1b68" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7a40-b391-f6703a6f1b68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-790d-b71e-446fbe3101a7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7a40-b391-f6703a6f1b68" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-790d-b71e-446fbe3101a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-ec70-7277-93cb-23e2c2a43815" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-790d-b71e-446fbe3101a7" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-ec70-7277-93cb-23e2c2a43815" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-777d-b376-b8762da4f3df" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-790d-b71e-446fbe3101a7" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-777d-b376-b8762da4f3df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-ec70-7331-8bad-6e1eb3716d6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-790d-b71e-446fbe3101a7" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-ec70-7331-8bad-6e1eb3716d6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingVariableInterestEntitiesVIEandInvestmentsinRelatedPartyMember_019ef4b5-ec70-7d40-a7c0-b62ad12960d0" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingVariableInterestEntitiesVIEandInvestmentsinRelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-790d-b71e-446fbe3101a7" xlink:to="loc_ahl_ConsolidatedEntityExcludingVariableInterestEntitiesVIEandInvestmentsinRelatedPartyMember_019ef4b5-ec70-7d40-a7c0-b62ad12960d0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7acd-b578-3122ae33b8ca" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationTable_019ef4b5-ec70-7e63-82a4-a241ac6b86f9" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7acd-b578-3122ae33b8ca" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7acd-b578-3122ae33b8ca_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7acd-b578-3122ae33b8ca" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7acd-b578-3122ae33b8ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7060-84b6-1dd0563825c4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7acd-b578-3122ae33b8ca" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7060-84b6-1dd0563825c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019ef4b5-ec70-736a-a344-b3ffe69f4411" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7060-84b6-1dd0563825c4" xlink:to="loc_us-gaap_UniversalLifeMember_019ef4b5-ec70-736a-a344-b3ffe69f4411" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AmerUsClosedBlockMember_019ef4b5-ec70-7f0a-be9e-23b7c490c4c0" xlink:href="ahl-20260630.xsd#ahl_AmerUsClosedBlockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7060-84b6-1dd0563825c4" xlink:to="loc_ahl_AmerUsClosedBlockMember_019ef4b5-ec70-7f0a-be9e-23b7c490c4c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_IndianapolisLifeInsuranceCompanyClosedBlockMember_019ef4b5-ec70-7665-a089-0cd5ff596cbe" xlink:href="ahl-20260630.xsd#ahl_IndianapolisLifeInsuranceCompanyClosedBlockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7060-84b6-1dd0563825c4" xlink:to="loc_ahl_IndianapolisLifeInsuranceCompanyClosedBlockMember_019ef4b5-ec70-7665-a089-0cd5ff596cbe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019ef4b5-ec70-7d28-a54c-093ce7a5f72c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019ef4b5-ec70-7d28-a54c-093ce7a5f72c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_019ef4b5-ec70-7b69-b7be-899d73d93fcd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_019ef4b5-ec70-7b69-b7be-899d73d93fcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019ef4b5-ec70-7a3d-b685-1d74e6008194" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019ef4b5-ec70-7a3d-b685-1d74e6008194" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019ef4b5-ec70-7a18-8fc9-a84b5550060b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019ef4b5-ec70-7a18-8fc9-a84b5550060b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_019ef4b5-ec70-75c8-9ca0-4730df6b2e8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_019ef4b5-ec70-75c8-9ca0-4730df6b2e8c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019ef4b5-ec70-762a-a986-5a8a8943a930" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_019ef4b5-ec70-762a-a986-5a8a8943a930" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019ef4b5-ec70-722a-8a68-d001f89a62bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_019ef4b5-ec70-722a-8a68-d001f89a62bc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019ef4b5-ec70-7302-898a-46421a699e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019ef4b5-ec70-7302-898a-46421a699e5a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019ef4b5-ec70-78e0-8ef2-c4508ab3fc08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019ef4b5-ec70-78e0-8ef2-c4508ab3fc08" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_019ef4b5-ec70-7dd7-8d53-2aee99dc6bbd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues_019ef4b5-ec70-7dd7-8d53-2aee99dc6bbd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019ef4b5-ec70-7b33-bf7c-118c6465a39f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019ef4b5-ec70-7b33-bf7c-118c6465a39f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019ef4b5-ec70-7a0e-bab8-993f978081a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019ef4b5-ec70-7a0e-bab8-993f978081a5" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements_019ef4b5-ec70-797f-9ec9-e05bd89fcb18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements_019ef4b5-ec70-797f-9ec9-e05bd89fcb18" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019ef4b5-ec70-77aa-b1a8-348dcf2f2f43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3_019ef4b5-ec70-77aa-b1a8-348dcf2f2f43" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019ef4b5-ec70-723e-ae13-53c8355bdd09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_019ef4b5-ec70-723e-ae13-53c8355bdd09" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019ef4b5-ec70-79e7-99e9-fb91070c98e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019ef4b5-ec70-79e7-99e9-fb91070c98e6" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019ef4b5-ec70-7e7d-90ea-a484b646b865" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019ef4b5-ec70-7e7d-90ea-a484b646b865" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019ef4b5-ec70-7ba1-870d-87851f33bc61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019ef4b5-ec70-7ba1-870d-87851f33bc61" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3IncludingPriorPeriodAdjustmentsTotalLevel3Assets_019ef602-4974-79b0-a775-508208a97999" xlink:href="ahl-20260630.xsd#ahl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3IncludingPriorPeriodAdjustmentsTotalLevel3Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_ahl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3IncludingPriorPeriodAdjustmentsTotalLevel3Assets_019ef602-4974-79b0-a775-508208a97999" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3IncludingPriorPeriodAdjustments_019ef602-4974-7968-a42d-70b5b45d1509" xlink:href="ahl-20260630.xsd#ahl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3IncludingPriorPeriodAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_FairValueAssetsandLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationLineItems_019ef4b5-ec70-7040-91e9-303e302a777c" xlink:to="loc_ahl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3IncludingPriorPeriodAdjustments_019ef602-4974-7968-a42d-70b5b45d1509" xlink:type="arc" order="19"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/FairValueSummaryofUnobservableInputsfortheEmbeddedDerivativesofInterestSensitiveContractLiabilitiesDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#FairValueSummaryofUnobservableInputsfortheEmbeddedDerivativesofInterestSensitiveContractLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/FairValueSummaryofUnobservableInputsfortheEmbeddedDerivativesofInterestSensitiveContractLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019ef4b5-ec70-7cd9-97f6-abf3ff9e5361" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019ef4b5-ec70-75a8-a5e9-dcd9582956b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019ef4b5-ec70-7cd9-97f6-abf3ff9e5361" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019ef4b5-ec70-75a8-a5e9-dcd9582956b2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-7412-bb9d-1c5376c2e797" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019ef4b5-ec70-75a8-a5e9-dcd9582956b2" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-7412-bb9d-1c5376c2e797" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-7412-bb9d-1c5376c2e797_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-7412-bb9d-1c5376c2e797" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-7412-bb9d-1c5376c2e797_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-7360-b97a-ce7e8e277945" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019ef4b5-ec70-7412-bb9d-1c5376c2e797" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-7360-b97a-ce7e8e277945" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-ec70-7da0-bfec-d6057f48493e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ef4b5-ec70-7360-b97a-ce7e8e277945" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019ef4b5-ec70-7da0-bfec-d6057f48493e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019ef4b5-ec70-7854-ba49-e00e0d7f4493" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019ef4b5-ec70-75a8-a5e9-dcd9582956b2" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019ef4b5-ec70-7854-ba49-e00e0d7f4493" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7854-ba49-e00e0d7f4493_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019ef4b5-ec70-7854-ba49-e00e0d7f4493" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7854-ba49-e00e0d7f4493_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7a93-93e4-e66bf2f331b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019ef4b5-ec70-7854-ba49-e00e0d7f4493" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7a93-93e4-e66bf2f331b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputEntityCreditRiskMember_019ef4b5-ec70-7d97-b668-045020af2478" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputEntityCreditRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7a93-93e4-e66bf2f331b2" xlink:to="loc_us-gaap_MeasurementInputEntityCreditRiskMember_019ef4b5-ec70-7d97-b668-045020af2478" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputOptionVolatilityMember_019ef4b5-ec70-7deb-9948-e319d3397be9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputOptionVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7a93-93e4-e66bf2f331b2" xlink:to="loc_us-gaap_MeasurementInputOptionVolatilityMember_019ef4b5-ec70-7deb-9948-e319d3397be9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputWithdrawalRateMember_019ef4b5-ec70-7f2c-9b91-e91d5ade0cbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputWithdrawalRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7a93-93e4-e66bf2f331b2" xlink:to="loc_us-gaap_MeasurementInputWithdrawalRateMember_019ef4b5-ec70-7f2c-9b91-e91d5ade0cbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_019ef4b5-ec70-784a-bfb7-dad523a4062c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7a93-93e4-e66bf2f331b2" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_019ef4b5-ec70-784a-bfb7-dad523a4062c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-7c1c-afc6-f2a972bf41af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019ef4b5-ec70-75a8-a5e9-dcd9582956b2" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-7c1c-afc6-f2a972bf41af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-7c1c-afc6-f2a972bf41af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-7c1c-afc6-f2a972bf41af" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-7c1c-afc6-f2a972bf41af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-73c6-827b-65521a408474" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019ef4b5-ec70-7c1c-afc6-f2a972bf41af" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-73c6-827b-65521a408474" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestSensitiveContractsMember_019ef4b5-ec70-7191-aecc-57eef2b71b04" xlink:href="ahl-20260630.xsd#ahl_InterestSensitiveContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019ef4b5-ec70-73c6-827b-65521a408474" xlink:to="loc_ahl_InterestSensitiveContractsMember_019ef4b5-ec70-7191-aecc-57eef2b71b04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019ef4b5-ec70-73d3-8619-a7a0e29ceb45" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019ef4b5-ec70-75a8-a5e9-dcd9582956b2" xlink:to="loc_srt_RangeAxis_019ef4b5-ec70-73d3-8619-a7a0e29ceb45" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ef4b5-ec70-73d3-8619-a7a0e29ceb45_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019ef4b5-ec70-73d3-8619-a7a0e29ceb45" xlink:to="loc_srt_RangeMember_019ef4b5-ec70-73d3-8619-a7a0e29ceb45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ef4b5-ec70-7052-803f-ec5c03afe57a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019ef4b5-ec70-73d3-8619-a7a0e29ceb45" xlink:to="loc_srt_RangeMember_019ef4b5-ec70-7052-803f-ec5c03afe57a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019ef4b5-ec70-7ebf-abf9-34bc94cd3f7f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ef4b5-ec70-7052-803f-ec5c03afe57a" xlink:to="loc_srt_MinimumMember_019ef4b5-ec70-7ebf-abf9-34bc94cd3f7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019ef4b5-ec70-7f13-994b-bcb5382d6002" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ef4b5-ec70-7052-803f-ec5c03afe57a" xlink:to="loc_srt_MaximumMember_019ef4b5-ec70-7f13-994b-bcb5382d6002" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019ef4b5-ec70-789e-9a53-c95ff845144f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ef4b5-ec70-7052-803f-ec5c03afe57a" xlink:to="loc_srt_WeightedAverageMember_019ef4b5-ec70-789e-9a53-c95ff845144f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-ec70-77d4-9c9e-052cc19f968c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019ef4b5-ec70-75a8-a5e9-dcd9582956b2" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-ec70-77d4-9c9e-052cc19f968c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-77d4-9c9e-052cc19f968c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-ec70-77d4-9c9e-052cc19f968c" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-77d4-9c9e-052cc19f968c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-760a-a7d7-b537b47bc9a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-ec70-77d4-9c9e-052cc19f968c" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-760a-a7d7-b537b47bc9a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019ef4b5-ec70-7236-8df4-005e040194c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-760a-a7d7-b537b47bc9a0" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019ef4b5-ec70-7236-8df4-005e040194c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019ef4b5-ec70-74d2-b6be-cd640de73e6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019ef4b5-ec70-75a8-a5e9-dcd9582956b2" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019ef4b5-ec70-74d2-b6be-cd640de73e6c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-74d2-b6be-cd640de73e6c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019ef4b5-ec70-74d2-b6be-cd640de73e6c" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-74d2-b6be-cd640de73e6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-7c50-9a8f-6898a7eb0d4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019ef4b5-ec70-74d2-b6be-cd640de73e6c" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-7c50-9a8f-6898a7eb0d4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019ef4b5-ec70-7dbb-bc5e-5a695422e2cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-7c50-9a8f-6898a7eb0d4f" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019ef4b5-ec70-7dbb-bc5e-5a695422e2cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_RecoverabilityMember_019ef4b5-ec70-7755-9702-a112e5876fc6" xlink:href="ahl-20260630.xsd#ahl_RecoverabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-7c50-9a8f-6898a7eb0d4f" xlink:to="loc_ahl_RecoverabilityMember_019ef4b5-ec70-7755-9702-a112e5876fc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_NetTangibleAssetValuesMember_019ef4b5-ec70-7aea-930e-55f0de0eac94" xlink:href="ahl-20260630.xsd#ahl_NetTangibleAssetValuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-7c50-9a8f-6898a7eb0d4f" xlink:to="loc_ahl_NetTangibleAssetValuesMember_019ef4b5-ec70-7aea-930e-55f0de0eac94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ReportedNetAssetValueMember_019ef4b5-ec70-76e2-a260-a3c0dac81590" xlink:href="ahl-20260630.xsd#ahl_ReportedNetAssetValueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-7c50-9a8f-6898a7eb0d4f" xlink:to="loc_ahl_ReportedNetAssetValueMember_019ef4b5-ec70-76e2-a260-a3c0dac81590" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_MortgageLoansMeasurementInput_019ef4b5-ec70-7fdb-9c96-57beba433756" xlink:href="ahl-20260630.xsd#ahl_MortgageLoansMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019ef4b5-ec70-7cd9-97f6-abf3ff9e5361" xlink:to="loc_ahl_MortgageLoansMeasurementInput_019ef4b5-ec70-7fdb-9c96-57beba433756" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019ef4b5-ec70-7581-a8f0-1734bd27b027" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019ef4b5-ec70-7cd9-97f6-abf3ff9e5361" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019ef4b5-ec70-7581-a8f0-1734bd27b027" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeLiabilityMeasurementInput_019ef4b5-ec70-7224-9d45-fb376c568622" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmbeddedDerivativeLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019ef4b5-ec70-7cd9-97f6-abf3ff9e5361" xlink:to="loc_us-gaap_EmbeddedDerivativeLiabilityMeasurementInput_019ef4b5-ec70-7224-9d45-fb376c568622" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_MeasurementInputForAvailableForSaleDebtSecuritiesTradingSecuritiesAndEquitySecurities_019ef4b5-ec70-7c8b-a516-f0cbc2a310f7" xlink:href="ahl-20260630.xsd#ahl_MeasurementInputForAvailableForSaleDebtSecuritiesTradingSecuritiesAndEquitySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019ef4b5-ec70-7cd9-97f6-abf3ff9e5361" xlink:to="loc_ahl_MeasurementInputForAvailableForSaleDebtSecuritiesTradingSecuritiesAndEquitySecurities_019ef4b5-ec70-7c8b-a516-f0cbc2a310f7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AvailableForSaleDebtSecuritiesTradingSecuritiesAndEquitySecurities_019ef4b5-ec70-7fd4-afee-f42629c85be4" xlink:href="ahl-20260630.xsd#ahl_AvailableForSaleDebtSecuritiesTradingSecuritiesAndEquitySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019ef4b5-ec70-7cd9-97f6-abf3ff9e5361" xlink:to="loc_ahl_AvailableForSaleDebtSecuritiesTradingSecuritiesAndEquitySecurities_019ef4b5-ec70-7fd4-afee-f42629c85be4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-ec70-7ab4-bbcc-f7a9e8da3707" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019ef4b5-ec70-7cd9-97f6-abf3ff9e5361" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-ec70-7ab4-bbcc-f7a9e8da3707" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFunds_019ef4b5-ec70-76b6-84f0-887255ffa82d" xlink:href="ahl-20260630.xsd#ahl_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019ef4b5-ec70-7cd9-97f6-abf3ff9e5361" xlink:to="loc_ahl_InvestmentFunds_019ef4b5-ec70-76b6-84f0-887255ffa82d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMeasurementInput_019ef4b5-ec70-73b2-b470-6028ea1a7d52" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019ef4b5-ec70-7cd9-97f6-abf3ff9e5361" xlink:to="loc_ahl_InvestmentFundsMeasurementInput_019ef4b5-ec70-73b2-b470-6028ea1a7d52" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/FairValueFinancialInstrumentsNotCarriedatFairValueDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#FairValueFinancialInstrumentsNotCarriedatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/FairValueFinancialInstrumentsNotCarriedatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019ef4b5-ec70-7bf3-8bb9-0596c1dab8a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019ef4b5-ec70-73a7-b453-c94f7965a8a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019ef4b5-ec70-7bf3-8bb9-0596c1dab8a3" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019ef4b5-ec70-73a7-b453-c94f7965a8a2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-7ea3-b651-07fd6e9462f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019ef4b5-ec70-73a7-b453-c94f7965a8a2" xlink:to="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-7ea3-b651-07fd6e9462f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-7ea3-b651-07fd6e9462f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-7ea3-b651-07fd6e9462f4" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-7ea3-b651-07fd6e9462f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-7522-a19d-b54c06ade70f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-7ea3-b651-07fd6e9462f4" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-7522-a19d-b54c06ade70f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFundsMember_019ef4b5-ec70-75ad-9496-5244e3218192" xlink:href="ahl-20260630.xsd#ahl_InvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-7522-a19d-b54c06ade70f" xlink:to="loc_ahl_InvestmentFundsMember_019ef4b5-ec70-75ad-9496-5244e3218192" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec70-7ecf-9e62-64f891065939" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019ef4b5-ec70-73a7-b453-c94f7965a8a2" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec70-7ecf-9e62-64f891065939" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7ecf-9e62-64f891065939_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec70-7ecf-9e62-64f891065939" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7ecf-9e62-64f891065939_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7b23-93fa-e221ecf8f42e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec70-7ecf-9e62-64f891065939" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7b23-93fa-e221ecf8f42e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-77a4-8ea3-50b413d000d8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7b23-93fa-e221ecf8f42e" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-77a4-8ea3-50b413d000d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-ec70-7ec9-a221-d324881954a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019ef4b5-ec70-73a7-b453-c94f7965a8a2" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-ec70-7ec9-a221-d324881954a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-7ec9-a221-d324881954a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-ec70-7ec9-a221-d324881954a2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-7ec9-a221-d324881954a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-7820-af31-d3b394fc5f69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ef4b5-ec70-7ec9-a221-d324881954a2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-7820-af31-d3b394fc5f69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019ef4b5-ec70-7e30-ab04-e1f8bf4b3bf0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-7820-af31-d3b394fc5f69" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019ef4b5-ec70-7e30-ab04-e1f8bf4b3bf0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019ef4b5-ec70-70ce-b66b-80fc938f7082" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-7820-af31-d3b394fc5f69" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019ef4b5-ec70-70ce-b66b-80fc938f7082" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019ef4b5-ec70-74da-82ff-00c7f4084edc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-7820-af31-d3b394fc5f69" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019ef4b5-ec70-74da-82ff-00c7f4084edc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019ef4b5-ec70-72c1-83f1-b787e65821e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ef4b5-ec70-7820-af31-d3b394fc5f69" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019ef4b5-ec70-72c1-83f1-b787e65821e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-ec70-7c0f-96a5-b6a344a1aba5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019ef4b5-ec70-73a7-b453-c94f7965a8a2" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-ec70-7c0f-96a5-b6a344a1aba5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-ec70-7c0f-96a5-b6a344a1aba5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-ec70-7c0f-96a5-b6a344a1aba5" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-ec70-7c0f-96a5-b6a344a1aba5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-ec70-7cfe-a979-064974bb2e75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019ef4b5-ec70-7c0f-96a5-b6a344a1aba5" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-ec70-7cfe-a979-064974bb2e75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019ef4b5-ec70-7f9d-b7f9-2fca1e2bf8bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-ec70-7cfe-a979-064974bb2e75" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019ef4b5-ec70-7f9d-b7f9-2fca1e2bf8bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019ef4b5-ec70-71aa-a04f-e01d26856d91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-ec70-7cfe-a979-064974bb2e75" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019ef4b5-ec70-71aa-a04f-e01d26856d91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-ec70-7ffd-9ff2-65c689512349" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ef4b5-ec70-7cfe-a979-064974bb2e75" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ef4b5-ec70-7ffd-9ff2-65c689512349" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7cfa-89dc-b74497ad603c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019ef4b5-ec70-73a7-b453-c94f7965a8a2" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7cfa-89dc-b74497ad603c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7cfa-89dc-b74497ad603c_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7cfa-89dc-b74497ad603c" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7cfa-89dc-b74497ad603c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-74e8-bb06-09b8904cb66c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7cfa-89dc-b74497ad603c" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-74e8-bb06-09b8904cb66c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-ec70-7aef-9d91-0c54c48ea77e" xlink:href="ahl-20260630.xsd#ahl_ConsolidatedEntityExcludingAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-74e8-bb06-09b8904cb66c" xlink:to="loc_ahl_ConsolidatedEntityExcludingAffiliatedEntityMember_019ef4b5-ec70-7aef-9d91-0c54c48ea77e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-7c0a-b4c9-c6611a823ea2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-74e8-bb06-09b8904cb66c" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-7c0a-b4c9-c6611a823ea2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-ec70-70e5-8d50-823261106e41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-74e8-bb06-09b8904cb66c" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ef4b5-ec70-70e5-8d50-823261106e41" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019ef4b5-ec70-7441-9f3e-000feb154dd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019ef4b5-ec70-7bf3-8bb9-0596c1dab8a3" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019ef4b5-ec70-7441-9f3e-000feb154dd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFunds_019ef4b5-ec70-7d48-8202-51e92bc14224" xlink:href="ahl-20260630.xsd#ahl_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019ef4b5-ec70-7441-9f3e-000feb154dd4" xlink:to="loc_ahl_InvestmentFunds_019ef4b5-ec70-7d48-8202-51e92bc14224" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsurancePolicy_019ef4b5-ec70-769d-bb52-be875230b934" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansInsurancePolicy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019ef4b5-ec70-7441-9f3e-000feb154dd4" xlink:to="loc_us-gaap_LoansInsurancePolicy_019ef4b5-ec70-769d-bb52-be875230b934" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsAsset_019ef4b5-ec70-7e06-ba19-2b72138e6998" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FundsHeldUnderReinsuranceAgreementsAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019ef4b5-ec70-7441-9f3e-000feb154dd4" xlink:to="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsAsset_019ef4b5-ec70-7e06-ba19-2b72138e6998" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019ef4b5-ec70-79bf-834a-6e0df8de3dcc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019ef4b5-ec70-7441-9f3e-000feb154dd4" xlink:to="loc_us-gaap_OtherInvestments_019ef4b5-ec70-79bf-834a-6e0df8de3dcc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019ef4b5-ec70-7e7e-8ac8-74b121faf6da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019ef4b5-ec70-7441-9f3e-000feb154dd4" xlink:to="loc_us-gaap_ShortTermInvestments_019ef4b5-ec70-7e7e-8ac8-74b121faf6da" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019ef4b5-ec70-7d19-b7da-5d042678fab8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019ef4b5-ec70-7441-9f3e-000feb154dd4" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019ef4b5-ec70-7d19-b7da-5d042678fab8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019ef4b5-ec70-7697-8263-faadb271edfc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019ef4b5-ec70-7bf3-8bb9-0596c1dab8a3" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019ef4b5-ec70-7697-8263-faadb271edfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-ec70-72c6-98b9-eb2b19606085" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderContractDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019ef4b5-ec70-7697-8263-faadb271edfc" xlink:to="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-ec70-72c6-98b9-eb2b19606085" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019ef4b5-ec70-7a1d-bdff-5557d9607c98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019ef4b5-ec70-7697-8263-faadb271edfc" xlink:to="loc_us-gaap_LongTermDebt_019ef4b5-ec70-7a1d-bdff-5557d9607c98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_019ef4b5-ec70-7b66-abc3-b4a724ac86c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019ef4b5-ec70-7697-8263-faadb271edfc" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchase_019ef4b5-ec70-7b66-abc3-b4a724ac86c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsLiability_019ef4b5-ec70-79ea-a6c0-1ac6aaf44a39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FundsHeldUnderReinsuranceAgreementsLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019ef4b5-ec70-7697-8263-faadb271edfc" xlink:to="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsLiability_019ef4b5-ec70-79ea-a6c0-1ac6aaf44a39" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_019ef4b5-ec70-7233-8aab-d9cb106f1097" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019ef4b5-ec70-7697-8263-faadb271edfc" xlink:to="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_019ef4b5-ec70-7233-8aab-d9cb106f1097" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019f4373-22ac-772f-aec3-1636d0fd4775" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019ef4b5-ec70-7bf3-8bb9-0596c1dab8a3" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019f4373-22ac-772f-aec3-1636d0fd4775" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/DeferredAcquisitionCostsDeferredSalesInducementsandValueofBusinessAcquiredRollForwardofDACDSIandVOBADetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#DeferredAcquisitionCostsDeferredSalesInducementsandValueofBusinessAcquiredRollForwardofDACDSIandVOBADetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/DeferredAcquisitionCostsDeferredSalesInducementsandValueofBusinessAcquiredRollForwardofDACDSIandVOBADetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_019ef4b5-ec70-7c47-8a1c-3311807f9fa2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostTable_019ef4b5-ec70-7182-ad5b-9420d4a9e684" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_019ef4b5-ec70-7c47-8a1c-3311807f9fa2" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostTable_019ef4b5-ec70-7182-ad5b-9420d4a9e684" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-758f-85e9-9f9ee3848bfa" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostTable_019ef4b5-ec70-7182-ad5b-9420d4a9e684" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-758f-85e9-9f9ee3848bfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-758f-85e9-9f9ee3848bfa_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-758f-85e9-9f9ee3848bfa" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-758f-85e9-9f9ee3848bfa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-70eb-9794-28d3415287b7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-758f-85e9-9f9ee3848bfa" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-70eb-9794-28d3415287b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-73c4-a9cd-36d493d9dfd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-70eb-9794-28d3415287b7" xlink:to="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-73c4-a9cd-36d493d9dfd7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-79a2-8995-fadf3ec171f8" xlink:href="ahl-20260630.xsd#ahl_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-70eb-9794-28d3415287b7" xlink:to="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-79a2-8995-fadf3ec171f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherInvestmentTypesMember_019ef4b5-ec70-7343-a74f-76599e9851bf" xlink:href="ahl-20260630.xsd#ahl_OtherInvestmentTypesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-70eb-9794-28d3415287b7" xlink:to="loc_ahl_OtherInvestmentTypesMember_019ef4b5-ec70-7343-a74f-76599e9851bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-7e3a-8e65-44c489097b5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-70eb-9794-28d3415287b7" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-7e3a-8e65-44c489097b5a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019ef4b5-ec70-7187-960d-270f7b8e384a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_019ef4b5-ec70-7c47-8a1c-3311807f9fa2" xlink:to="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019ef4b5-ec70-7187-960d-270f7b8e384a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCosts_019ef4b5-ec70-7d68-ab1c-d99e2d4e95af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019ef4b5-ec70-7187-960d-270f7b8e384a" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCosts_019ef4b5-ec70-7d68-ab1c-d99e2d4e95af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostsAdditions_019ef4b5-ec70-7ea3-8d98-0789a129d90f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostsAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019ef4b5-ec70-7187-960d-270f7b8e384a" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostsAdditions_019ef4b5-ec70-7ea3-8d98-0789a129d90f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019ef4b5-ec70-77c3-b148-0ee565053db7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019ef4b5-ec70-7187-960d-270f7b8e384a" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019ef4b5-ec70-77c3-b148-0ee565053db7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostForeignCurrencyTranslationAdjustmentAndOther_019ef4b5-ec70-77ec-9505-e83f1ee6c092" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCostForeignCurrencyTranslationAdjustmentAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019ef4b5-ec70-7187-960d-270f7b8e384a" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostForeignCurrencyTranslationAdjustmentAndOther_019ef4b5-ec70-77ec-9505-e83f1ee6c092" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCosts_019ef4b5-ec70-79e9-a460-1c92d60d773d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredPolicyAcquisitionCosts"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019ef4b5-ec70-709d-a9fb-12348b5edeb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MovementInDeferredSalesInducementsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_019ef4b5-ec70-7c47-8a1c-3311807f9fa2" xlink:to="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019ef4b5-ec70-709d-a9fb-12348b5edeb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsNet_019ef4b5-ec70-7521-8012-c7b608b0c11b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredSalesInducementsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019ef4b5-ec70-709d-a9fb-12348b5edeb1" xlink:to="loc_us-gaap_DeferredSalesInducementsNet_019ef4b5-ec70-7521-8012-c7b608b0c11b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsAdditions_019ef4b5-ec70-79eb-92cf-6a62d949e913" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredSalesInducementsAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019ef4b5-ec70-709d-a9fb-12348b5edeb1" xlink:to="loc_us-gaap_DeferredSalesInducementsAdditions_019ef4b5-ec70-79eb-92cf-6a62d949e913" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsAmortizationExpense_019ef4b5-ec70-7bc0-837a-9d28061438b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredSalesInducementsAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019ef4b5-ec70-709d-a9fb-12348b5edeb1" xlink:to="loc_us-gaap_DeferredSalesInducementsAmortizationExpense_019ef4b5-ec70-7bc0-837a-9d28061438b1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsAdjustments_019ef4b5-ec70-7b90-bbd6-2bb768832d69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredSalesInducementsAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019ef4b5-ec70-709d-a9fb-12348b5edeb1" xlink:to="loc_us-gaap_DeferredSalesInducementsAdjustments_019ef4b5-ec70-7b90-bbd6-2bb768832d69" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsNet_019ef4b5-ec70-70d0-91d8-b00a3e6a1d6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredSalesInducementsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019ef4b5-ec70-7bfc-b2ec-ed4a1e23e128" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_019ef4b5-ec70-7c47-8a1c-3311807f9fa2" xlink:to="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019ef4b5-ec70-7bfc-b2ec-ed4a1e23e128" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019ef4b5-ec70-74f6-a5b9-1130c66db4b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValueOfBusinessAcquiredVOBA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019ef4b5-ec70-7bfc-b2ec-ed4a1e23e128" xlink:to="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019ef4b5-ec70-74f6-a5b9-1130c66db4b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAdditionsFromAcquisitions_019ef4b5-ec70-7cf7-b820-41a77b98055d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PresentValueOfFutureInsuranceProfitsAdditionsFromAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019ef4b5-ec70-7bfc-b2ec-ed4a1e23e128" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAdditionsFromAcquisitions_019ef4b5-ec70-7cf7-b820-41a77b98055d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1_019ef4b5-ec70-7ca2-987d-a73b5d243921" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019ef4b5-ec70-7bfc-b2ec-ed4a1e23e128" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1_019ef4b5-ec70-7ca2-987d-a73b5d243921" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitsForeignCurrencyTranslationGainLoss_019ef4b5-ec70-789e-8969-acfa7d482f7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PresentValueOfFutureInsuranceProfitsForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019ef4b5-ec70-7bfc-b2ec-ed4a1e23e128" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitsForeignCurrencyTranslationGainLoss_019ef4b5-ec70-789e-8969-acfa7d482f7f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019ef4b5-ec70-7925-a2ab-4db33a7c81d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValueOfBusinessAcquiredVOBA"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsRollForward_019ef4b5-ec70-7e55-ab7e-8286ddcc891e" xlink:href="ahl-20260630.xsd#ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_019ef4b5-ec70-7c47-8a1c-3311807f9fa2" xlink:to="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsRollForward_019ef4b5-ec70-7e55-ab7e-8286ddcc891e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfits_019ef4b5-ec70-756c-bc7d-bae3b0c669bb" xlink:href="ahl-20260630.xsd#ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsRollForward_019ef4b5-ec70-7e55-ab7e-8286ddcc891e" xlink:to="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfits_019ef4b5-ec70-756c-bc7d-bae3b0c669bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAdditions_019ef4b5-ec70-7514-ac98-fe6678c0c390" xlink:href="ahl-20260630.xsd#ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsRollForward_019ef4b5-ec70-7e55-ab7e-8286ddcc891e" xlink:to="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsAdditions_019ef4b5-ec70-7514-ac98-fe6678c0c390" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsAndPresentValueOfFutureProfitsAmortizationExpense_019ef4b5-ec70-7b7a-83f0-7120873b0373" xlink:href="ahl-20260630.xsd#ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsAndPresentValueOfFutureProfitsAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsRollForward_019ef4b5-ec70-7e55-ab7e-8286ddcc891e" xlink:to="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsAndPresentValueOfFutureProfitsAmortizationExpense_019ef4b5-ec70-7b7a-83f0-7120873b0373" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsAndPresentValueOfFutureProfitsForeignCurrencyTranslationGainLossAndOther_019ef4b5-ec70-7e2a-a8bd-789b9e45d036" xlink:href="ahl-20260630.xsd#ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsAndPresentValueOfFutureProfitsForeignCurrencyTranslationGainLossAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfitsRollForward_019ef4b5-ec70-7e55-ab7e-8286ddcc891e" xlink:to="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsAndPresentValueOfFutureProfitsForeignCurrencyTranslationGainLossAndOther_019ef4b5-ec70-7e2a-a8bd-789b9e45d036" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfits_019ef4b5-ec70-76aa-8494-83167a2871c1" xlink:href="ahl-20260630.xsd#ahl_DeferredPolicyAcquisitionCostsDeferredSalesInducementsandPresentValueofFutureProfits"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/LongdurationContractsPolicyholderAccountBalanceRollforwardDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#LongdurationContractsPolicyholderAccountBalanceRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/LongdurationContractsPolicyholderAccountBalanceRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-73c5-a15c-f424efc148db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceTable_019ef4b5-ec70-7945-9fd2-58944aff794d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-73c5-a15c-f424efc148db" xlink:to="loc_us-gaap_PolicyholderAccountBalanceTable_019ef4b5-ec70-7945-9fd2-58944aff794d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7eaa-8bc9-7fdd2f9471ed" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019ef4b5-ec70-7945-9fd2-58944aff794d" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7eaa-8bc9-7fdd2f9471ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7eaa-8bc9-7fdd2f9471ed_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7eaa-8bc9-7fdd2f9471ed" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7eaa-8bc9-7fdd2f9471ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-711b-9f8c-37b39f6a9538" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7eaa-8bc9-7fdd2f9471ed" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-711b-9f8c-37b39f6a9538" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-77bc-9626-c9b1da76a05c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-711b-9f8c-37b39f6a9538" xlink:to="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-77bc-9626-c9b1da76a05c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-7e0a-85ef-01b5a54a2565" xlink:href="ahl-20260630.xsd#ahl_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-711b-9f8c-37b39f6a9538" xlink:to="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-7e0a-85ef-01b5a54a2565" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherInvestmentTypesMember_019ef4b5-ec70-7042-a0e0-6b5bc04d4bff" xlink:href="ahl-20260630.xsd#ahl_OtherInvestmentTypesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-711b-9f8c-37b39f6a9538" xlink:to="loc_ahl_OtherInvestmentTypesMember_019ef4b5-ec70-7042-a0e0-6b5bc04d4bff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-7473-818b-1dda5cfb677b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-711b-9f8c-37b39f6a9538" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-7473-818b-1dda5cfb677b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceRollForward_019ef4b5-ec70-7c91-8678-70b50805ab22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-73c5-a15c-f424efc148db" xlink:to="loc_us-gaap_PolicyholderAccountBalanceRollForward_019ef4b5-ec70-7c91-8678-70b50805ab22" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds_019ef4b5-ec70-7169-8414-fca5d13be475" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019ef4b5-ec70-7c91-8678-70b50805ab22" xlink:to="loc_us-gaap_PolicyholderFunds_019ef4b5-ec70-7169-8414-fca5d13be475" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceIssuance_019ef4b5-ec70-7566-8f79-a95b676fd088" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019ef4b5-ec70-7c91-8678-70b50805ab22" xlink:to="loc_us-gaap_PolicyholderAccountBalanceIssuance_019ef4b5-ec70-7566-8f79-a95b676fd088" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalancePolicyCharge_019ef4b5-ec70-7bcd-bdaf-cc70e147fcf5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalancePolicyCharge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019ef4b5-ec70-7c91-8678-70b50805ab22" xlink:to="loc_us-gaap_PolicyholderAccountBalancePolicyCharge_019ef4b5-ec70-7bcd-bdaf-cc70e147fcf5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal_019ef4b5-ec70-74b5-b619-f0d42b83ac16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019ef4b5-ec70-7c91-8678-70b50805ab22" xlink:to="loc_us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal_019ef4b5-ec70-74b5-b619-f0d42b83ac16" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceBenefitPayment_019ef4b5-ec70-7bdc-be1e-d52b8d7218ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceBenefitPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019ef4b5-ec70-7c91-8678-70b50805ab22" xlink:to="loc_us-gaap_PolicyholderAccountBalanceBenefitPayment_019ef4b5-ec70-7bdc-be1e-d52b8d7218ae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCreditedToPolicyholdersAccountBalances_019ef4b5-ec70-780e-9ec7-745bffec4acb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestCreditedToPolicyholdersAccountBalances"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019ef4b5-ec70-7c91-8678-70b50805ab22" xlink:to="loc_us-gaap_InterestCreditedToPolicyholdersAccountBalances_019ef4b5-ec70-780e-9ec7-745bffec4acb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PolicyholderAccountBalanceForeignExchange_019ef4b5-ec70-7b57-9131-79de49d88f13" xlink:href="ahl-20260630.xsd#ahl_PolicyholderAccountBalanceForeignExchange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019ef4b5-ec70-7c91-8678-70b50805ab22" xlink:to="loc_ahl_PolicyholderAccountBalanceForeignExchange_019ef4b5-ec70-7b57-9131-79de49d88f13" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange_019ef4b5-ec70-714d-a656-f4dc50992af0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019ef4b5-ec70-7c91-8678-70b50805ab22" xlink:to="loc_us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange_019ef4b5-ec70-714d-a656-f4dc50992af0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds_019ef4b5-ec70-782c-b80c-3aee241cdee2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderFunds"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate_019ef4b5-ec70-7c96-a111-d3c28d304e18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-73c5-a15c-f424efc148db" xlink:to="loc_us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate_019ef4b5-ec70-7c96-a111-d3c28d304e18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceNetAmountAtRisk_019ef4b5-ec70-76d6-938a-73b1d24a0db1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceNetAmountAtRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-73c5-a15c-f424efc148db" xlink:to="loc_us-gaap_PolicyholderAccountBalanceNetAmountAtRisk_019ef4b5-ec70-76d6-938a-73b1d24a0db1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueDuePolicyholdersAmount_019ef4b5-ec70-7d17-90d9-76c0d80e1fd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashSurrenderValueDuePolicyholdersAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-73c5-a15c-f424efc148db" xlink:to="loc_us-gaap_CashSurrenderValueDuePolicyholdersAmount_019ef4b5-ec70-7d17-90d9-76c0d80e1fd7" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/LongdurationContractsReconciliationofAccountBalanceWithinInterestSensitiveContractBenefitsDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#LongdurationContractsReconciliationofAccountBalanceWithinInterestSensitiveContractBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/LongdurationContractsReconciliationofAccountBalanceWithinInterestSensitiveContractBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7287-9afe-eec3d769e2f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-718e-8c82-2a9888ca1927" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7287-9afe-eec3d769e2f4" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-718e-8c82-2a9888ca1927" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7014-b893-781129575ad7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-718e-8c82-2a9888ca1927" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7014-b893-781129575ad7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7014-b893-781129575ad7_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7014-b893-781129575ad7" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7014-b893-781129575ad7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7fde-b023-ef7e4a4d17f0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7014-b893-781129575ad7" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7fde-b023-ef7e4a4d17f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-7c4a-a9f0-45d9da0f9755" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7fde-b023-ef7e4a4d17f0" xlink:to="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-7c4a-a9f0-45d9da0f9755" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-75ac-a257-fddf42f0a67c" xlink:href="ahl-20260630.xsd#ahl_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7fde-b023-ef7e4a4d17f0" xlink:to="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-75ac-a257-fddf42f0a67c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherInvestmentTypesMember_019ef4b5-ec70-7b96-83d6-76264bc1ab01" xlink:href="ahl-20260630.xsd#ahl_OtherInvestmentTypesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7fde-b023-ef7e4a4d17f0" xlink:to="loc_ahl_OtherInvestmentTypesMember_019ef4b5-ec70-7b96-83d6-76264bc1ab01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ReconcilingItemsMember_019ef4b5-ec70-78f9-8326-3369a6693c9d" xlink:href="ahl-20260630.xsd#ahl_ReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7fde-b023-ef7e4a4d17f0" xlink:to="loc_ahl_ReconcilingItemsMember_019ef4b5-ec70-78f9-8326-3369a6693c9d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-7132-b018-81ddaca2655e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7fde-b023-ef7e4a4d17f0" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-7132-b018-81ddaca2655e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-ec70-7f65-83a1-7218c5d415b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderContractDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7287-9afe-eec3d769e2f4" xlink:to="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-ec70-7f65-83a1-7218c5d415b9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/LongdurationContractsAccountBalancesbyGuaranteedMinimumInterestRatesDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#LongdurationContractsAccountBalancesbyGuaranteedMinimumInterestRatesDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/LongdurationContractsAccountBalancesbyGuaranteedMinimumInterestRatesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-7520-929c-5c444f00a5b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceTable_019ef4b5-ec70-7d0b-8e23-214b476b49a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-7520-929c-5c444f00a5b5" xlink:to="loc_us-gaap_PolicyholderAccountBalanceTable_019ef4b5-ec70-7d0b-8e23-214b476b49a1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019ef4b5-ec70-7189-8a44-c7c56b383819" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019ef4b5-ec70-7d0b-8e23-214b476b49a1" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019ef4b5-ec70-7189-8a44-c7c56b383819" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019ef4b5-ec70-7189-8a44-c7c56b383819_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019ef4b5-ec70-7189-8a44-c7c56b383819" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019ef4b5-ec70-7189-8a44-c7c56b383819_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019ef4b5-ec70-7424-9ee5-92336b5b4b78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019ef4b5-ec70-7189-8a44-c7c56b383819" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019ef4b5-ec70-7424-9ee5-92336b5b4b78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember_019ef4b5-ec70-778d-807d-917f39213da5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019ef4b5-ec70-7424-9ee5-92336b5b4b78" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember_019ef4b5-ec70-778d-807d-917f39213da5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0100Member_019ef4b5-ec70-7ffb-abc9-7659e521f581" xlink:href="ahl-20260630.xsd#ahl_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0100Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019ef4b5-ec70-7424-9ee5-92336b5b4b78" xlink:to="loc_ahl_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0100Member_019ef4b5-ec70-7ffb-abc9-7659e521f581" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0100AndGreaterMember_019ef4b5-ec70-752d-95aa-8b0a428acab7" xlink:href="ahl-20260630.xsd#ahl_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0100AndGreaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019ef4b5-ec70-7424-9ee5-92336b5b4b78" xlink:to="loc_ahl_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0100AndGreaterMember_019ef4b5-ec70-752d-95aa-8b0a428acab7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019ef4b5-ec70-7c68-8676-9bba86d7f959" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019ef4b5-ec70-7d0b-8e23-214b476b49a1" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019ef4b5-ec70-7c68-8676-9bba86d7f959" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019ef4b5-ec70-7c68-8676-9bba86d7f959_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019ef4b5-ec70-7c68-8676-9bba86d7f959" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019ef4b5-ec70-7c68-8676-9bba86d7f959_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019ef4b5-ec70-72a3-b43d-6ae96e9d9033" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019ef4b5-ec70-7c68-8676-9bba86d7f959" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019ef4b5-ec70-72a3-b43d-6ae96e9d9033" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0000To2000Member_019ef4b5-ec70-7b88-adea-c7658c3cc099" xlink:href="ahl-20260630.xsd#ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0000To2000Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019ef4b5-ec70-72a3-b43d-6ae96e9d9033" xlink:to="loc_ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0000To2000Member_019ef4b5-ec70-7b88-adea-c7658c3cc099" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0200To0400Member_019ef4b5-ec70-7c18-b2ca-49105339e3ba" xlink:href="ahl-20260630.xsd#ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0200To0400Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019ef4b5-ec70-72a3-b43d-6ae96e9d9033" xlink:to="loc_ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0200To0400Member_019ef4b5-ec70-7c18-b2ca-49105339e3ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400To0600Member_019ef4b5-ec70-7a1f-b021-f983c3584638" xlink:href="ahl-20260630.xsd#ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400To0600Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019ef4b5-ec70-72a3-b43d-6ae96e9d9033" xlink:to="loc_ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0400To0600Member_019ef4b5-ec70-7a1f-b021-f983c3584638" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0600AndGreaterMember_019ef4b5-ec70-7e0c-9005-7792e41cff4c" xlink:href="ahl-20260630.xsd#ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0600AndGreaterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019ef4b5-ec70-72a3-b43d-6ae96e9d9033" xlink:to="loc_ahl_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0600AndGreaterMember_019ef4b5-ec70-7e0c-9005-7792e41cff4c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019ef4b5-ec70-7cc8-8f88-d73c4508d395" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019ef4b5-ec70-7d0b-8e23-214b476b49a1" xlink:to="loc_srt_RangeAxis_019ef4b5-ec70-7cc8-8f88-d73c4508d395" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ef4b5-ec70-7cc8-8f88-d73c4508d395_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019ef4b5-ec70-7cc8-8f88-d73c4508d395" xlink:to="loc_srt_RangeMember_019ef4b5-ec70-7cc8-8f88-d73c4508d395_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ef4b5-ec70-73bf-8117-a8095eea6da6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019ef4b5-ec70-7cc8-8f88-d73c4508d395" xlink:to="loc_srt_RangeMember_019ef4b5-ec70-73bf-8117-a8095eea6da6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019ef4b5-ec70-7795-9940-1296499a7729" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ef4b5-ec70-73bf-8117-a8095eea6da6" xlink:to="loc_srt_MaximumMember_019ef4b5-ec70-7795-9940-1296499a7729" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019ef4b5-ec70-7e5c-afb0-a1a3ba9800d4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ef4b5-ec70-73bf-8117-a8095eea6da6" xlink:to="loc_srt_MinimumMember_019ef4b5-ec70-7e5c-afb0-a1a3ba9800d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7c33-9bdd-0760b1567cbd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019ef4b5-ec70-7d0b-8e23-214b476b49a1" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7c33-9bdd-0760b1567cbd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7c33-9bdd-0760b1567cbd_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7c33-9bdd-0760b1567cbd" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7c33-9bdd-0760b1567cbd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75cd-a5bb-ff48344a9fea" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7c33-9bdd-0760b1567cbd" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75cd-a5bb-ff48344a9fea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-741c-beae-8a9e6021d592" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75cd-a5bb-ff48344a9fea" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-741c-beae-8a9e6021d592" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_IndexedAnnuityGMCRMember_019ef4b5-ec70-704d-ba27-c43d5e8a8ca2" xlink:href="ahl-20260630.xsd#ahl_IndexedAnnuityGMCRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75cd-a5bb-ff48344a9fea" xlink:to="loc_ahl_IndexedAnnuityGMCRMember_019ef4b5-ec70-704d-ba27-c43d5e8a8ca2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_IndexedAnnuityOtherMember_019ef4b5-ec70-7454-ad82-ac5a2b9068b5" xlink:href="ahl-20260630.xsd#ahl_IndexedAnnuityOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75cd-a5bb-ff48344a9fea" xlink:to="loc_ahl_IndexedAnnuityOtherMember_019ef4b5-ec70-7454-ad82-ac5a2b9068b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-74c8-9f62-da6ad570a01f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75cd-a5bb-ff48344a9fea" xlink:to="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-74c8-9f62-da6ad570a01f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-7949-8af2-3810bed77305" xlink:href="ahl-20260630.xsd#ahl_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75cd-a5bb-ff48344a9fea" xlink:to="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-7949-8af2-3810bed77305" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherInvestmentTypesMember_019ef4b5-ec70-7e32-b214-ac62481191d7" xlink:href="ahl-20260630.xsd#ahl_OtherInvestmentTypesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75cd-a5bb-ff48344a9fea" xlink:to="loc_ahl_OtherInvestmentTypesMember_019ef4b5-ec70-7e32-b214-ac62481191d7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditRating_019ef4b5-ec70-7e60-95cc-1a05644dd1d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditRating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-7520-929c-5c444f00a5b5" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditRating_019ef4b5-ec70-7e60-95cc-1a05644dd1d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate_019ef4b5-ec70-73d3-8ac4-ed993525bfe1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-7520-929c-5c444f00a5b5" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate_019ef4b5-ec70-73d3-8ac4-ed993525bfe1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds_019ef4b5-ec70-743c-9c79-a800811c14d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019ef4b5-ec70-7520-929c-5c444f00a5b5" xlink:to="loc_us-gaap_PolicyholderFunds_019ef4b5-ec70-743c-9c79-a800811c14d5" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/LongdurationContractsBalancesofandChangesinLiabilityforFuturePolicyBenefitsDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#LongdurationContractsBalancesofandChangesinLiabilityforFuturePolicyBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/LongdurationContractsBalancesofandChangesinLiabilityforFuturePolicyBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7933-956c-cc424d6f6d04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-79df-b768-cf15796d920a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7933-956c-cc424d6f6d04" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-79df-b768-cf15796d920a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-761b-a6c3-b8bf2b99ac6d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-79df-b768-cf15796d920a" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-761b-a6c3-b8bf2b99ac6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-761b-a6c3-b8bf2b99ac6d_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-761b-a6c3-b8bf2b99ac6d" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-761b-a6c3-b8bf2b99ac6d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7ab1-adaa-6c508f925704" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-761b-a6c3-b8bf2b99ac6d" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7ab1-adaa-6c508f925704" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PayoutAnnuityMember_019ef4b5-ec70-79ba-aba9-f8ab225055ac" xlink:href="ahl-20260630.xsd#ahl_PayoutAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7ab1-adaa-6c508f925704" xlink:to="loc_ahl_PayoutAnnuityMember_019ef4b5-ec70-79ba-aba9-f8ab225055ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WholeLifeInsuranceMember_019ef4b5-ec70-7350-92d3-8071e8fb4aef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WholeLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7ab1-adaa-6c508f925704" xlink:to="loc_us-gaap_WholeLifeInsuranceMember_019ef4b5-ec70-7350-92d3-8071e8fb4aef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PayoutAnnuityAndWholeLifeInsuranceMember_019fb8aa-526f-76af-b50c-4e226cdd2f40" xlink:href="ahl-20260630.xsd#ahl_PayoutAnnuityAndWholeLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7ab1-adaa-6c508f925704" xlink:to="loc_ahl_PayoutAnnuityAndWholeLifeInsuranceMember_019fb8aa-526f-76af-b50c-4e226cdd2f40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7933-956c-cc424d6f6d04" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019ef4b5-ec70-7b1e-82c9-35c1868497af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019ef4b5-ec70-7b1e-82c9-35c1868497af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax_019ef4b5-ec70-726e-b96f-0fb510923c82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax_019ef4b5-ec70-726e-b96f-0fb510923c82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AOCILiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchangeBeforeTax_019ef4b5-ec70-7b91-8bf2-8bfeb6f09284" xlink:href="ahl-20260630.xsd#ahl_AOCILiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchangeBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_ahl_AOCILiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchangeBeforeTax_019ef4b5-ec70-7b91-8bf2-8bfeb6f09284" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019ef4b5-ec70-7dd8-8229-1c2c25843064" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019ef4b5-ec70-7dd8-8229-1c2c25843064" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019ef4b5-ec70-7308-8b9e-80e005fff818" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019ef4b5-ec70-7308-8b9e-80e005fff818" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019ef4b5-ec70-7433-b18d-25b4098a5b59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019ef4b5-ec70-7433-b18d-25b4098a5b59" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumIssuance_019ef4b5-ec70-7654-9829-dc9fbe0cced4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumIssuance_019ef4b5-ec70-7654-9829-dc9fbe0cced4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome_019ef4b5-ec70-7744-b305-6b93fd71c284" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome_019ef4b5-ec70-7744-b305-6b93fd71c284" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected_019ef4b5-ec70-79db-a13a-a3fd3facd3d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected_019ef4b5-ec70-79db-a13a-a3fd3facd3d4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchange_019ef4b5-ec70-7e6c-8d57-944043cd7d12" xlink:href="ahl-20260630.xsd#ahl_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_ahl_LiabilityForFuturePolicyBenefitExpectedNetPremiumForeignExchange_019ef4b5-ec70-7e6c-8d57-944043cd7d12" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019ef4b5-ec70-732b-b95a-ae3720797522" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019f915b-a603-708b-9a1f-fa1c89c0fd38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChangeAbstract_019ef4b5-ec70-7f9a-9f77-fd0bb3ff1774" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019f915b-a603-708b-9a1f-fa1c89c0fd38" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7933-956c-cc424d6f6d04" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019ef4b5-ec70-7319-a8c3-1e2ae0b5983b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019ef4b5-ec70-7319-a8c3-1e2ae0b5983b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019ef4b5-ec70-79a4-ade1-77d5bab47dcc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019ef4b5-ec70-79a4-ade1-77d5bab47dcc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AOCILiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchangeBeforeTax_019ef4b5-ec70-78d1-b427-b6c238fe4ea5" xlink:href="ahl-20260630.xsd#ahl_AOCILiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchangeBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_ahl_AOCILiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchangeBeforeTax_019ef4b5-ec70-78d1-b427-b6c238fe4ea5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019ef4b5-ec70-7d29-bd4c-297fa6a8bbb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019ef4b5-ec70-7d29-bd4c-297fa6a8bbb4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019ef4b5-ec70-76bb-a3d7-2ba55adaf74c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019ef4b5-ec70-76bb-a3d7-2ba55adaf74c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019ef4b5-ec70-70bd-843c-9f9ca887ed30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019ef4b5-ec70-70bd-843c-9f9ca887ed30" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019ef4b5-ec70-7184-a02e-22d16ed4e4b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019ef4b5-ec70-7184-a02e-22d16ed4e4b6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019ef4b5-ec70-7ae1-b9cb-ee8a3234cc17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019ef4b5-ec70-7ae1-b9cb-ee8a3234cc17" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019ef4b5-ec70-77b2-9d45-06e2a2a6cf95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019ef4b5-ec70-77b2-9d45-06e2a2a6cf95" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange_019ef4b5-ec70-7009-b763-4b4ee749b2c3" xlink:href="ahl-20260630.xsd#ahl_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_ahl_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange_019ef4b5-ec70-7009-b763-4b4ee749b2c3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019ef4b5-ec70-7023-a6cb-eb61ed042dd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019ef4b5-ec70-757c-a844-5f72dabdc8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsurance_019ef4b5-ec70-73fb-8b4d-84db00bb7296" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitAfterReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsurance_019ef4b5-ec70-73fb-8b4d-84db00bb7296" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitReinsuranceRecoverableAfterAllowance_019f914b-94ed-7059-8a42-51534a0a0fed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitReinsuranceRecoverableAfterAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitReinsuranceRecoverableAfterAllowance_019f914b-94ed-7059-8a42-51534a0a0fed" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration_019ef4b5-ec70-7fc9-9c8f-e18052c7c471" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration_019ef4b5-ec70-7fc9-9c8f-e18052c7c471" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate_019ef4b5-ec70-7432-add3-12908a226859" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate_019ef4b5-ec70-7432-add3-12908a226859" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate_019ef4b5-ec70-76fa-92d5-09a6a7ce43e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate_019ef4b5-ec70-76fa-92d5-09a6a7ce43e1" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance_019ef4b5-ec70-7fd4-aec5-d07609b3168a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance_019ef4b5-ec70-7fd4-aec5-d07609b3168a" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance_019ef4b5-ec70-7cb1-858b-af7a45bd2e1f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance_019ef4b5-ec70-7cb1-858b-af7a45bd2e1f" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance_019ef4b5-ec70-7d57-ba43-9b6375fe4ddc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019ef4b5-ec70-79b6-a13f-a4440702aac3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance_019ef4b5-ec70-7d57-ba43-9b6375fe4ddc" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/LongdurationContractsReconciliationofFuturePolicyBenefitsDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#LongdurationContractsReconciliationofFuturePolicyBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/LongdurationContractsReconciliationofFuturePolicyBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7359-8874-ce92b0b589e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-770d-af31-7dcbe28cde4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7359-8874-ce92b0b589e3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-770d-af31-7dcbe28cde4d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7c17-95cc-93a3738bf659" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-770d-af31-7dcbe28cde4d" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7c17-95cc-93a3738bf659" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7c17-95cc-93a3738bf659_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7c17-95cc-93a3738bf659" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7c17-95cc-93a3738bf659_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7a43-bd16-f4ddc184e845" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7c17-95cc-93a3738bf659" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7a43-bd16-f4ddc184e845" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PayoutAnnuityMember_019ef4b5-ec70-704b-9a11-1777a6eecf85" xlink:href="ahl-20260630.xsd#ahl_PayoutAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7a43-bd16-f4ddc184e845" xlink:to="loc_ahl_PayoutAnnuityMember_019ef4b5-ec70-704b-9a11-1777a6eecf85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WholeLifeInsuranceMember_019ef4b5-ec70-7cc6-842d-37f6320e443f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WholeLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7a43-bd16-f4ddc184e845" xlink:to="loc_us-gaap_WholeLifeInsuranceMember_019ef4b5-ec70-7cc6-842d-37f6320e443f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ReconcilingItemsMember_019ef4b5-ec70-74b0-a593-698100cfc3a6" xlink:href="ahl-20260630.xsd#ahl_ReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7a43-bd16-f4ddc184e845" xlink:to="loc_ahl_ReconcilingItemsMember_019ef4b5-ec70-74b0-a593-698100cfc3a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019ef4b5-ec70-7027-af29-a8e45e0f1d7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7359-8874-ce92b0b589e3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019ef4b5-ec70-7027-af29-a8e45e0f1d7c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/LongdurationContractsPremiumReconciliationDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#LongdurationContractsPremiumReconciliationDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/LongdurationContractsPremiumReconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7301-a6c7-88c6238d65f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-7c4a-aa0e-5494b3412962" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7301-a6c7-88c6238d65f3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-7c4a-aa0e-5494b3412962" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-79be-aea4-f44bdd2f1c4d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019ef4b5-ec70-7c4a-aa0e-5494b3412962" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-79be-aea4-f44bdd2f1c4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-79be-aea4-f44bdd2f1c4d_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-79be-aea4-f44bdd2f1c4d" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-79be-aea4-f44bdd2f1c4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75fa-8554-cfa9dec53700" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-79be-aea4-f44bdd2f1c4d" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75fa-8554-cfa9dec53700" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PayoutAnnuityMember_019ef4b5-ec70-78da-b1f7-b5b520b482d3" xlink:href="ahl-20260630.xsd#ahl_PayoutAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75fa-8554-cfa9dec53700" xlink:to="loc_ahl_PayoutAnnuityMember_019ef4b5-ec70-78da-b1f7-b5b520b482d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ReconcilingItemsMember_019ef4b5-ec70-714d-a78f-0a445671d3e9" xlink:href="ahl-20260630.xsd#ahl_ReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75fa-8554-cfa9dec53700" xlink:to="loc_ahl_ReconcilingItemsMember_019ef4b5-ec70-714d-a78f-0a445671d3e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WholeLifeInsuranceMember_019ef4b5-ec70-7b5b-94db-a8c9ec92943f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WholeLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75fa-8554-cfa9dec53700" xlink:to="loc_us-gaap_WholeLifeInsuranceMember_019ef4b5-ec70-7b5b-94db-a8c9ec92943f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitGrossPremiumIncome_019ef4b5-ec70-7dfc-9f94-09af7e364c88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitGrossPremiumIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7301-a6c7-88c6238d65f3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitGrossPremiumIncome_019ef4b5-ec70-7dfc-9f94-09af7e364c88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitInterestExpense_019ef4b5-ec70-7740-9a9e-44bde41f77dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019ef4b5-ec70-7301-a6c7-88c6238d65f3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitInterestExpense_019ef4b5-ec70-7740-9a9e-44bde41f77dd" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/LongdurationContractsNarrativeDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#LongdurationContractsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/LongdurationContractsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceActivityTable_019ef4b5-ec70-76d4-a990-52c3cd083f9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalLiabilityLongDurationInsuranceActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceActivityTable_019ef4b5-ec70-76d4-a990-52c3cd083f9f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7b79-a3b3-a2f370129117" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceActivityTable_019ef4b5-ec70-76d4-a990-52c3cd083f9f" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7b79-a3b3-a2f370129117" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7b79-a3b3-a2f370129117_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7b79-a3b3-a2f370129117" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7b79-a3b3-a2f370129117_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7021-af44-b6400c53d8eb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7b79-a3b3-a2f370129117" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7021-af44-b6400c53d8eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PayoutAnnuityMember_019ef4b5-ec70-7ce1-b559-f8a5495fe487" xlink:href="ahl-20260630.xsd#ahl_PayoutAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7021-af44-b6400c53d8eb" xlink:to="loc_ahl_PayoutAnnuityMember_019ef4b5-ec70-7ce1-b559-f8a5495fe487" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitPeriodIncreaseDecrease_019ef4b5-ec70-7890-8f83-77333d04da26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitPeriodIncreaseDecrease_019ef4b5-ec70-7890-8f83-77333d04da26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019ef4b5-ec70-78c2-9dd9-3600e119e297" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019ef4b5-ec70-78c2-9dd9-3600e119e297" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019ef4b5-ec70-7f61-b1ed-eb10bfcaf69d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019ef4b5-ec70-7f61-b1ed-eb10bfcaf69d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AOCILiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTaxAndAOCILiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019ef4b5-ec70-7fe4-8bbd-bd2189997bbd" xlink:href="ahl-20260630.xsd#ahl_AOCILiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTaxAndAOCILiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_ahl_AOCILiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTaxAndAOCILiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019ef4b5-ec70-7fe4-8bbd-bd2189997bbd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange_019ef4b5-ec70-7900-afde-4b6bc5ec3c83" xlink:href="ahl-20260630.xsd#ahl_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_ahl_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitForeignExchange_019ef4b5-ec70-7900-afde-4b6bc5ec3c83" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019ef4b5-ec70-7bcf-b3b9-0a6aa77360be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019ef4b5-ec70-7bcf-b3b9-0a6aa77360be" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitAdverseDevelopmentExpense_019ef4b5-ec70-7b60-8965-64c6ae958816" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilityForFuturePolicyBenefitAdverseDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitAdverseDevelopmentExpense_019ef4b5-ec70-7b60-8965-64c6ae958816" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitPeriodIncreaseDecrease_019ef4b5-ec70-7706-b543-627e839c9461" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_MarketRiskBenefitPeriodIncreaseDecrease_019ef4b5-ec70-7706-b543-627e839c9461" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange_019ef4b5-ec70-7a5b-9932-e9094b6f115e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange_019ef4b5-ec70-7a5b-9932-e9094b6f115e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIssuance_019ef4b5-ec70-7ff7-8c67-b09d385c8e8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_MarketRiskBenefitIssuance_019ef4b5-ec70-7ff7-8c67-b09d385c8e8f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitInterestExpense_019ef4b5-ec70-7d7e-bc62-b9897d64c945" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_MarketRiskBenefitInterestExpense_019ef4b5-ec70-7d7e-bc62-b9897d64c945" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_019ef4b5-ec70-79a4-9993-034ef7e718e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitAttributedFeeCollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_019ef4b5-ec70-79a4-9993-034ef7e718e0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBenefitPayment_019fa557-a5c8-7d1a-b062-7bc9090751e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitBenefitPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdditionalLiabilityLongDurationInsuranceLineItems_019ef4b5-ec70-775b-a572-41c56be36d64" xlink:to="loc_us-gaap_MarketRiskBenefitBenefitPayment_019fa557-a5c8-7d1a-b062-7bc9090751e6" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/LongdurationContractsMarketRiskBenefitsDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#LongdurationContractsMarketRiskBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/LongdurationContractsMarketRiskBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-74ed-bac4-67773a1fd9be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7795-84cc-4f7eaf7ef879" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-74ed-bac4-67773a1fd9be" xlink:to="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7795-84cc-4f7eaf7ef879" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7bf3-b14f-0886d94741fd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7795-84cc-4f7eaf7ef879" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7bf3-b14f-0886d94741fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7bf3-b14f-0886d94741fd_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7bf3-b14f-0886d94741fd" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7bf3-b14f-0886d94741fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7ee4-9451-68b95bae229d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-7bf3-b14f-0886d94741fd" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7ee4-9451-68b95bae229d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-79e1-871e-7d071c782949" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7ee4-9451-68b95bae229d" xlink:to="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-79e1-871e-7d071c782949" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-7d8c-b230-31b8421e3075" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-7ee4-9451-68b95bae229d" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-7d8c-b230-31b8421e3075" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-74ed-bac4-67773a1fd9be" xlink:to="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019ef4b5-ec70-7130-8c8d-9aa321679776" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019ef4b5-ec70-7130-8c8d-9aa321679776" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax_019ef4b5-ec70-79b2-8604-fb10a2a10e06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax_019ef4b5-ec70-79b2-8604-fb10a2a10e06" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019ef4b5-ec70-7860-bf64-525a0a0c3c99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019ef4b5-ec70-7860-bf64-525a0a0c3c99" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIssuance_019ef4b5-ec70-7927-ba6c-1c541664150f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitIssuance_019ef4b5-ec70-7927-ba6c-1c541664150f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitInterestExpense_019ef4b5-ec70-771a-ba6c-da2e161634a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitInterestExpense_019ef4b5-ec70-771a-ba6c-da2e161634a7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_019ef4b5-ec70-7f1e-9af2-032d0bc32f99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitAttributedFeeCollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_019ef4b5-ec70-7f1e-9af2-032d0bc32f99" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBenefitPayment_019ef4b5-ec70-7c15-8a20-1a1d39ac41b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitBenefitPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitBenefitPayment_019ef4b5-ec70-7c15-8a20-1a1d39ac41b7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange_019ef4b5-ec70-76bf-a9fc-5b58abbd585c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromInterestRateChange_019ef4b5-ec70-76bf-a9fc-5b58abbd585c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange_019ef4b5-ec70-7017-8f4c-025137b6e1fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange_019ef4b5-ec70-7017-8f4c-025137b6e1fc" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromActualPolicyholderBehaviorDifferentFromExpected_019ef4b5-ec70-7ba6-9b5f-f487a7e3b8e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromActualPolicyholderBehaviorDifferentFromExpected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromActualPolicyholderBehaviorDifferentFromExpected_019ef4b5-ec70-7ba6-9b5f-f487a7e3b8e7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019ef4b5-ec70-72e6-b8bb-2b928fa3a680" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance_019ef4b5-ec70-7735-9ccc-740acc9a4874" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance_019ef4b5-ec70-7735-9ccc-740acc9a4874" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019ef4b5-ec70-7c8b-a91d-5b59c435b80b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019ef4b5-ec70-767b-8e2b-bef1712057cf" xlink:to="loc_us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019ef4b5-ec70-7c8b-a91d-5b59c435b80b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019ef4b5-ec70-74b8-a543-09b696a02536" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitNetAmountAtRisk_019ef4b5-ec70-7a03-9749-b5a79d4d104b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitNetAmountAtRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-74ed-bac4-67773a1fd9be" xlink:to="loc_us-gaap_MarketRiskBenefitNetAmountAtRisk_019ef4b5-ec70-7a03-9749-b5a79d4d104b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAge1_019ef4b5-ec70-786e-b2fd-71dcd5b6e134" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-74ed-bac4-67773a1fd9be" xlink:to="loc_us-gaap_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAge1_019ef4b5-ec70-786e-b2fd-71dcd5b6e134" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/LongdurationContractsMarketRiskReconciliationDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#LongdurationContractsMarketRiskReconciliationDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/LongdurationContractsMarketRiskReconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-70d2-b192-0ccb10b786f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7eee-987e-54f24f5be8e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-70d2-b192-0ccb10b786f8" xlink:to="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7eee-987e-54f24f5be8e7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-75da-9082-93fc821b44a6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7eee-987e-54f24f5be8e7" xlink:to="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-75da-9082-93fc821b44a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75da-9082-93fc821b44a6_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-75da-9082-93fc821b44a6" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-75da-9082-93fc821b44a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-73e1-8d67-b8b1cc55ed80" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019ef4b5-ec70-75da-9082-93fc821b44a6" xlink:to="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-73e1-8d67-b8b1cc55ed80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-7d37-bcb9-0b9149bcfa80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-73e1-8d67-b8b1cc55ed80" xlink:to="loc_us-gaap_IndexedAnnuityMember_019ef4b5-ec70-7d37-bcb9-0b9149bcfa80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-747e-8a91-94ffe67e1d2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019ef4b5-ec70-73e1-8d67-b8b1cc55ed80" xlink:to="loc_us-gaap_DeferredFixedAnnuityMember_019ef4b5-ec70-747e-8a91-94ffe67e1d2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAssetAmount_019ef4b5-ec70-7ae1-ac73-1a1f26cf8eec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitAssetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-70d2-b192-0ccb10b786f8" xlink:to="loc_us-gaap_MarketRiskBenefitAssetAmount_019ef4b5-ec70-7ae1-ac73-1a1f26cf8eec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019ef4b5-ec70-7f36-93a1-ab7744e6ea1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-70d2-b192-0ccb10b786f8" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019ef4b5-ec70-7f36-93a1-ab7744e6ea1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019ef4b5-ec70-7f3a-8898-25e9db398012" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-70d2-b192-0ccb10b786f8" xlink:to="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019ef4b5-ec70-7f3a-8898-25e9db398012" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/LongdurationContractsSignificantInputsandAssumptionsDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#LongdurationContractsSignificantInputsandAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/LongdurationContractsSignificantInputsandAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-7376-b869-60f039820aa6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7455-a225-ed3d78edee2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-7376-b869-60f039820aa6" xlink:to="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7455-a225-ed3d78edee2d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019ef4b5-ec70-7fd2-960d-cd72763624d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7455-a225-ed3d78edee2d" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019ef4b5-ec70-7fd2-960d-cd72763624d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7fd2-960d-cd72763624d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019ef4b5-ec70-7fd2-960d-cd72763624d4" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7fd2-960d-cd72763624d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7f30-a026-b7c9af9c735d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019ef4b5-ec70-7fd2-960d-cd72763624d4" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7f30-a026-b7c9af9c735d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_MeasurementInputNonperformanceRiskMember_019ef4b5-ec70-77ce-8f17-b8f2812a65ae" xlink:href="ahl-20260630.xsd#ahl_MeasurementInputNonperformanceRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7f30-a026-b7c9af9c735d" xlink:to="loc_ahl_MeasurementInputNonperformanceRiskMember_019ef4b5-ec70-77ce-8f17-b8f2812a65ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_MeasurementInputOptionBudgetMember_019ef4b5-ec70-7a21-83c1-d011a25c3299" xlink:href="ahl-20260630.xsd#ahl_MeasurementInputOptionBudgetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7f30-a026-b7c9af9c735d" xlink:to="loc_ahl_MeasurementInputOptionBudgetMember_019ef4b5-ec70-7a21-83c1-d011a25c3299" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_MeasurementInputSurrenderRateMember_019ef4b5-ec70-7833-9f2b-90ec34087208" xlink:href="ahl-20260630.xsd#ahl_MeasurementInputSurrenderRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7f30-a026-b7c9af9c735d" xlink:to="loc_ahl_MeasurementInputSurrenderRateMember_019ef4b5-ec70-7833-9f2b-90ec34087208" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputUtilizationRateMember_019ef4b5-ec70-7210-b5bd-c95f89d936d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputUtilizationRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019ef4b5-ec70-7f30-a026-b7c9af9c735d" xlink:to="loc_us-gaap_MeasurementInputUtilizationRateMember_019ef4b5-ec70-7210-b5bd-c95f89d936d9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019ef4b5-ec70-7ec2-b548-9254e6b63e00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7455-a225-ed3d78edee2d" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019ef4b5-ec70-7ec2-b548-9254e6b63e00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-7ec2-b548-9254e6b63e00_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019ef4b5-ec70-7ec2-b548-9254e6b63e00" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-7ec2-b548-9254e6b63e00_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-78cb-a78b-509099cfcdf0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019ef4b5-ec70-7ec2-b548-9254e6b63e00" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-78cb-a78b-509099cfcdf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019ef4b5-ec70-7450-92eb-8d132ba74b68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019ef4b5-ec70-78cb-a78b-509099cfcdf0" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019ef4b5-ec70-7450-92eb-8d132ba74b68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019ef4b5-ec70-7a6a-bd99-3ab78f7f4fb8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019ef4b5-ec70-7455-a225-ed3d78edee2d" xlink:to="loc_srt_RangeAxis_019ef4b5-ec70-7a6a-bd99-3ab78f7f4fb8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ef4b5-ec70-7a6a-bd99-3ab78f7f4fb8_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019ef4b5-ec70-7a6a-bd99-3ab78f7f4fb8" xlink:to="loc_srt_RangeMember_019ef4b5-ec70-7a6a-bd99-3ab78f7f4fb8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ef4b5-ec70-7808-9e9e-945bef7a6c2a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019ef4b5-ec70-7a6a-bd99-3ab78f7f4fb8" xlink:to="loc_srt_RangeMember_019ef4b5-ec70-7808-9e9e-945bef7a6c2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019ef4b5-ec70-7e3c-b30f-39a5c7c98eef" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ef4b5-ec70-7808-9e9e-945bef7a6c2a" xlink:to="loc_srt_MinimumMember_019ef4b5-ec70-7e3c-b30f-39a5c7c98eef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019ef4b5-ec70-7a92-8f87-6f4ebff5abcf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ef4b5-ec70-7808-9e9e-945bef7a6c2a" xlink:to="loc_srt_MaximumMember_019ef4b5-ec70-7a92-8f87-6f4ebff5abcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019ef4b5-ec70-7a7c-9e29-3f8ed6147735" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ef4b5-ec70-7808-9e9e-945bef7a6c2a" xlink:to="loc_srt_WeightedAverageMember_019ef4b5-ec70-7a7c-9e29-3f8ed6147735" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019ef4b5-ec70-753b-8700-f3b7dbf4bb9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-7376-b869-60f039820aa6" xlink:to="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019ef4b5-ec70-753b-8700-f3b7dbf4bb9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitMeasurementInput_019ef4b5-ec70-7ab4-8f54-9c54a6bf5fc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketRiskBenefitMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019ef4b5-ec70-7376-b869-60f039820aa6" xlink:to="loc_us-gaap_MarketRiskBenefitMeasurementInput_019ef4b5-ec70-7ab4-8f54-9c54a6bf5fc6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/DebtDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#DebtDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/DebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019fbb7b-75f8-7fac-95f0-e8742ac698da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_019f4330-fa5d-7426-97a0-2d9bbf3ca5e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fbb7b-75f8-7fac-95f0-e8742ac698da" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019f4330-fa5d-7426-97a0-2d9bbf3ca5e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019f4330-fa5d-7308-aa2b-b9eb7990d995" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_019f4330-fa5d-7426-97a0-2d9bbf3ca5e4" xlink:to="loc_us-gaap_DebtInstrumentAxis_019f4330-fa5d-7308-aa2b-b9eb7990d995" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019f4330-fa5d-7308-aa2b-b9eb7990d995_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019f4330-fa5d-7308-aa2b-b9eb7990d995" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019f4330-fa5d-7308-aa2b-b9eb7990d995_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019f4330-fa5d-7d45-b724-a9be6f5a9e6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019f4330-fa5d-7308-aa2b-b9eb7990d995" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019f4330-fa5d-7d45-b724-a9be6f5a9e6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019f4330-fa5d-7d70-96b2-4c8c6c55b8cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f4330-fa5d-7d45-b724-a9be6f5a9e6d" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019f4330-fa5d-7d70-96b2-4c8c6c55b8cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_LiquidityFacilityMember_019f4331-b65f-7590-a5d4-bbe7e8e9e7ad" xlink:href="ahl-20260630.xsd#ahl_LiquidityFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f4330-fa5d-7d45-b724-a9be6f5a9e6d" xlink:to="loc_ahl_LiquidityFacilityMember_019f4331-b65f-7590-a5d4-bbe7e8e9e7ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_019fbb7b-75f8-7148-9276-365de1d55089" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fbb7b-75f8-7fac-95f0-e8742ac698da" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_019fbb7b-75f8-7148-9276-365de1d55089" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019fbb7b-75f8-73ad-920c-5a2f049fdcf2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fbb7b-75f8-7fac-95f0-e8742ac698da" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019fbb7b-75f8-73ad-920c-5a2f049fdcf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_LineOfCreditFacilityCovenantTermsMaximumConsolidatedDebtToCapitalizationRatio_019fbb7b-75f8-71f7-8f45-08ffdd5da09c" xlink:href="ahl-20260630.xsd#ahl_LineOfCreditFacilityCovenantTermsMaximumConsolidatedDebtToCapitalizationRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fbb7b-75f8-7fac-95f0-e8742ac698da" xlink:to="loc_ahl_LineOfCreditFacilityCovenantTermsMaximumConsolidatedDebtToCapitalizationRatio_019fbb7b-75f8-71f7-8f45-08ffdd5da09c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_LineOfCreditFacilityCovenantTermsConsolidatedNetWorthRequirementAmount_019fbb7b-75f8-7034-a2ad-50f638075a46" xlink:href="ahl-20260630.xsd#ahl_LineOfCreditFacilityCovenantTermsConsolidatedNetWorthRequirementAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fbb7b-75f8-7fac-95f0-e8742ac698da" xlink:to="loc_ahl_LineOfCreditFacilityCovenantTermsConsolidatedNetWorthRequirementAmount_019fbb7b-75f8-7034-a2ad-50f638075a46" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_LongTermDebtTermExtension_019fbb7b-75f8-7e9e-97d3-e8f157999b51" xlink:href="ahl-20260630.xsd#ahl_LongTermDebtTermExtension"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fbb7b-75f8-7fac-95f0-e8742ac698da" xlink:to="loc_ahl_LongTermDebtTermExtension_019fbb7b-75f8-7e9e-97d3-e8f157999b51" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtInstrumentTermLoanConversionMaturityPeriod_019fbb7b-75f8-7ca2-a73a-701f276b52c3" xlink:href="ahl-20260630.xsd#ahl_DebtInstrumentTermLoanConversionMaturityPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fbb7b-75f8-7fac-95f0-e8742ac698da" xlink:to="loc_ahl_DebtInstrumentTermLoanConversionMaturityPeriod_019fbb7b-75f8-7ca2-a73a-701f276b52c3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_019fbb7b-75f8-71a0-b146-b8e45fe6f39b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019fbb7b-75f8-7fac-95f0-e8742ac698da" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_019fbb7b-75f8-71a0-b146-b8e45fe6f39b" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/DebtLongtermNotesDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#DebtLongtermNotesDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/DebtLongtermNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019fbb46-7bbd-70f7-8ff5-d1a21e157aab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019fbb46-7bbd-7782-9e83-ef37a6ecc718" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fbb46-7bbd-70f7-8ff5-d1a21e157aab" xlink:to="loc_us-gaap_DebtInstrumentTable_019fbb46-7bbd-7782-9e83-ef37a6ecc718" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019fbb46-7bbd-71d2-b526-e61a0af5f13d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019fbb46-7bbd-7782-9e83-ef37a6ecc718" xlink:to="loc_us-gaap_DebtInstrumentAxis_019fbb46-7bbd-71d2-b526-e61a0af5f13d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-71d2-b526-e61a0af5f13d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019fbb46-7bbd-71d2-b526-e61a0af5f13d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-71d2-b526-e61a0af5f13d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019fbb46-7bbd-71d2-b526-e61a0af5f13d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019fbb46-7bbd-74fe-8418-85f6f51d1ade" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_us-gaap_SeniorNotesMember_019fbb46-7bbd-74fe-8418-85f6f51d1ade" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_JuniorSubordinatedDebtMember_019fbb46-7bbd-7497-9b99-149da644e167" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_JuniorSubordinatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_us-gaap_JuniorSubordinatedDebtMember_019fbb46-7bbd-7497-9b99-149da644e167" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SeniorNotesDue2028Member_019fbb8a-6d26-7fcd-9d80-1e73dd5c8552" xlink:href="ahl-20260630.xsd#ahl_SeniorNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_SeniorNotesDue2028Member_019fbb8a-6d26-7fcd-9d80-1e73dd5c8552" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SeniorNotesdue2030Member_019fbb8a-6d26-7f41-867e-dc38b8e34756" xlink:href="ahl-20260630.xsd#ahl_SeniorNotesdue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_SeniorNotesdue2030Member_019fbb8a-6d26-7f41-867e-dc38b8e34756" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SeniorNotesDue2031Member_019fbb8a-6d26-7ce6-8a14-e9d10237ade5" xlink:href="ahl-20260630.xsd#ahl_SeniorNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_SeniorNotesDue2031Member_019fbb8a-6d26-7ce6-8a14-e9d10237ade5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SeniorNotesDue2033Member_019fbb8a-6d26-767a-b605-0c0a31159dbd" xlink:href="ahl-20260630.xsd#ahl_SeniorNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_SeniorNotesDue2033Member_019fbb8a-6d26-767a-b605-0c0a31159dbd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SeniorNotesDue2034Member_019fbb8a-6d26-783e-97fc-85ac173615de" xlink:href="ahl-20260630.xsd#ahl_SeniorNotesDue2034Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_SeniorNotesDue2034Member_019fbb8a-6d26-783e-97fc-85ac173615de" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SeniorNotesDue2051Member_019fbb8a-6d26-7798-8ee1-1b228894c467" xlink:href="ahl-20260630.xsd#ahl_SeniorNotesDue2051Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_SeniorNotesDue2051Member_019fbb8a-6d26-7798-8ee1-1b228894c467" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SeniorNotesDue2052Member_019fbb8a-6d26-737a-a602-72a9b4fccb39" xlink:href="ahl-20260630.xsd#ahl_SeniorNotesDue2052Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_SeniorNotesDue2052Member_019fbb8a-6d26-737a-a602-72a9b4fccb39" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SeniorNotesDue2054Member_019fbb8a-6d26-7e65-b4d4-730bb2acb888" xlink:href="ahl-20260630.xsd#ahl_SeniorNotesDue2054Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_SeniorNotesDue2054Member_019fbb8a-6d26-7e65-b4d4-730bb2acb888" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SeniorNotesDue2055Member_019fbb8a-6d26-7fca-84fb-07876e58064f" xlink:href="ahl-20260630.xsd#ahl_SeniorNotesDue2055Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_SeniorNotesDue2055Member_019fbb8a-6d26-7fca-84fb-07876e58064f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_JuniorSubordinatedDebtDue2054Member_019fbb8a-6d26-7ee6-9bc5-26a84b2af69a" xlink:href="ahl-20260630.xsd#ahl_JuniorSubordinatedDebtDue2054Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_JuniorSubordinatedDebtDue2054Member_019fbb8a-6d26-7ee6-9bc5-26a84b2af69a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_JuniorSubordinatedDebtDue2055Member_019fbb8a-6d26-7bd1-a3d7-20caba77bf7c" xlink:href="ahl-20260630.xsd#ahl_JuniorSubordinatedDebtDue2055Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_JuniorSubordinatedDebtDue2055Member_019fbb8a-6d26-7bd1-a3d7-20caba77bf7c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_JuniorSubordinatedDebtDue2064Member_019fbb8a-6d26-744a-b81e-dc01315b9fa9" xlink:href="ahl-20260630.xsd#ahl_JuniorSubordinatedDebtDue2064Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_JuniorSubordinatedDebtDue2064Member_019fbb8a-6d26-744a-b81e-dc01315b9fa9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SeniorNotesDue2036Member_019fd399-e8a5-7b60-aac1-842049d7d18b" xlink:href="ahl-20260630.xsd#ahl_SeniorNotesDue2036Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019fbb46-7bbd-7ada-a018-191d0424e82b" xlink:to="loc_ahl_SeniorNotesDue2036Member_019fd399-e8a5-7b60-aac1-842049d7d18b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019fbb46-7bbd-7ea6-849a-c49c4490873c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019fbb46-7bbd-7782-9e83-ef37a6ecc718" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019fbb46-7bbd-7ea6-849a-c49c4490873c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019fbb46-7bbd-7ea6-849a-c49c4490873c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019fbb46-7bbd-7ea6-849a-c49c4490873c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019fbb46-7bbd-7ea6-849a-c49c4490873c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019fbb46-7bbd-793e-9e6f-e5bc8706a3f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019fbb46-7bbd-7ea6-849a-c49c4490873c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019fbb46-7bbd-793e-9e6f-e5bc8706a3f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019fbb46-7bbd-70ad-a629-c7355bb8cf27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019fbb46-7bbd-7782-9e83-ef37a6ecc718" xlink:to="loc_us-gaap_VariableRateAxis_019fbb46-7bbd-70ad-a629-c7355bb8cf27" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019fbb46-7bbd-70ad-a629-c7355bb8cf27_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019fbb46-7bbd-70ad-a629-c7355bb8cf27" xlink:to="loc_us-gaap_VariableRateDomain_019fbb46-7bbd-70ad-a629-c7355bb8cf27_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019fbb46-7bbd-767d-8d42-ad56e436fa24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019fbb46-7bbd-70ad-a629-c7355bb8cf27" xlink:to="loc_us-gaap_VariableRateDomain_019fbb46-7bbd-767d-8d42-ad56e436fa24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019fbb46-7bbd-740c-9ab1-bf2e6cd2d037" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019fbb46-7bbd-7782-9e83-ef37a6ecc718" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019fbb46-7bbd-740c-9ab1-bf2e6cd2d037" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019fbb46-7bbd-740c-9ab1-bf2e6cd2d037_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019fbb46-7bbd-740c-9ab1-bf2e6cd2d037" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019fbb46-7bbd-740c-9ab1-bf2e6cd2d037_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019fbb46-7bbd-7f1c-8b53-b38e8c092dfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019fbb46-7bbd-740c-9ab1-bf2e6cd2d037" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019fbb46-7bbd-7f1c-8b53-b38e8c092dfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019fbb46-7bbd-7d6c-855b-95d271479f1f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019fbb46-7bbd-7782-9e83-ef37a6ecc718" xlink:to="loc_srt_RangeAxis_019fbb46-7bbd-7d6c-855b-95d271479f1f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019fbb46-7bbd-7d6c-855b-95d271479f1f_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019fbb46-7bbd-7d6c-855b-95d271479f1f" xlink:to="loc_srt_RangeMember_019fbb46-7bbd-7d6c-855b-95d271479f1f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019fbb46-7bbd-7438-8c35-f2bda6d14b3f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019fbb46-7bbd-7d6c-855b-95d271479f1f" xlink:to="loc_srt_RangeMember_019fbb46-7bbd-7438-8c35-f2bda6d14b3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019fd398-5037-7ac8-aa05-43adf82c1bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019fbb46-7bbd-7782-9e83-ef37a6ecc718" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019fd398-5037-7ac8-aa05-43adf82c1bdb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019fd398-5037-7ac8-aa05-43adf82c1bdb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019fd398-5037-7ac8-aa05-43adf82c1bdb" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019fd398-5037-7ac8-aa05-43adf82c1bdb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019fd398-5037-723f-a894-c5e7684467b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019fd398-5037-7ac8-aa05-43adf82c1bdb" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019fd398-5037-723f-a894-c5e7684467b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019fd398-8226-7700-ab31-875ef68554ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019fd398-5037-723f-a894-c5e7684467b7" xlink:to="loc_us-gaap_SubsequentEventMember_019fd398-8226-7700-ab31-875ef68554ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_019fbb46-7bbd-725e-b31a-a9193d917067" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fbb46-7bbd-70f7-8ff5-d1a21e157aab" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_019fbb46-7bbd-725e-b31a-a9193d917067" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DebtInstrumentDeferredInterestPaymentsPeriod_019fbb46-7bbd-7593-a8e4-e50a69162c85" xlink:href="ahl-20260630.xsd#ahl_DebtInstrumentDeferredInterestPaymentsPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fbb46-7bbd-70f7-8ff5-d1a21e157aab" xlink:to="loc_ahl_DebtInstrumentDeferredInterestPaymentsPeriod_019fbb46-7bbd-7593-a8e4-e50a69162c85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019fbb8a-6d26-7a1c-ac1a-3682b02c9e61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fbb46-7bbd-70f7-8ff5-d1a21e157aab" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019fbb8a-6d26-7a1c-ac1a-3682b02c9e61" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentIssuanceDate1_019fbb8a-6d26-77a2-94a4-4cbb2e8af16f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentIssuanceDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fbb46-7bbd-70f7-8ff5-d1a21e157aab" xlink:to="loc_us-gaap_DebtInstrumentIssuanceDate1_019fbb8a-6d26-77a2-94a4-4cbb2e8af16f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturityDate_019fbb8a-6d26-7027-8619-810418d12af5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fbb46-7bbd-70f7-8ff5-d1a21e157aab" xlink:to="loc_us-gaap_LongTermDebtMaturityDate_019fbb8a-6d26-7027-8619-810418d12af5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019fbb8a-6d26-732f-baff-bfc193dbad05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fbb46-7bbd-70f7-8ff5-d1a21e157aab" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019fbb8a-6d26-732f-baff-bfc193dbad05" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019fbb8a-6d26-7146-840c-b7e0a7c06721" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019fbb46-7bbd-70f7-8ff5-d1a21e157aab" xlink:to="loc_us-gaap_LongTermDebt_019fbb8a-6d26-7146-840c-b7e0a7c06721" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/EquityAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#EquityAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/EquityAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019ef4b5-ec70-7b41-8f3f-20ade1d34fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019ef4b5-ec70-7f39-a3ea-ad7deb8c684a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019ef4b5-ec70-7b41-8f3f-20ade1d34fa6" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019ef4b5-ec70-7f39-a3ea-ad7deb8c684a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-7d0c-8653-96ffff493aac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019ef4b5-ec70-7f39-a3ea-ad7deb8c684a" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-7d0c-8653-96ffff493aac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7d0c-8653-96ffff493aac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-7d0c-8653-96ffff493aac" xlink:to="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7d0c-8653-96ffff493aac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-7d0c-8653-96ffff493aac" xlink:to="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember_019ef4b5-ec70-79b1-8439-219b942817b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossParentMember_019ef4b5-ec70-79b1-8439-219b942817b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossIncludingNoncontrollingInterestMember_019ef4b5-ec70-729e-98ee-74e2db65e525" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossIncludingNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossIncludingNoncontrollingInterestMember_019ef4b5-ec70-729e-98ee-74e2db65e525" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossNoncontrollingInterestMember_019ef4b5-ec70-7873-b0b6-2bf27023b288" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithoutAllowanceForCreditLossNoncontrollingInterestMember_019ef4b5-ec70-7873-b0b6-2bf27023b288" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember_019ef4b5-ec70-74bd-8b48-370f3c84ce4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossParentMember_019ef4b5-ec70-74bd-8b48-370f3c84ce4b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossIncludingNoncontrollingInterestMember_019ef4b5-ec70-78a6-a6f2-ad29653d315f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossIncludingNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossIncludingNoncontrollingInterestMember_019ef4b5-ec70-78a6-a6f2-ad29653d315f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossNoncontrollingInterestMember_019ef4b5-ec70-7fdd-9d76-b57b543d8981" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociGainLossDebtSecuritiesAvailableForSaleWithAllowanceForCreditLossNoncontrollingInterestMember_019ef4b5-ec70-7fdd-9d76-b57b543d8981" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitParentMember_019ef4b5-ec70-7b76-89a3-7a29de0ba1e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitParentMember_019ef4b5-ec70-7b76-89a3-7a29de0ba1e2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossDerivativeQualifyingAsHedgeExcludedComponentIncludingPortionAttributableToNoncontrollingInterestMember_019ef4b5-ec70-7879-9662-9702defe290f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossDerivativeQualifyingAsHedgeExcludedComponentIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossDerivativeQualifyingAsHedgeExcludedComponentIncludingPortionAttributableToNoncontrollingInterestMember_019ef4b5-ec70-7879-9662-9702defe290f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskParentMember_019ef4b5-ec70-7c50-b3bd-985c0d284d27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskParentMember_019ef4b5-ec70-7c50-b3bd-985c0d284d27" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember_019ef4b5-ec70-785f-b97b-d17f018253b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentParentMember_019ef4b5-ec70-785f-b97b-d17f018253b8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019ef4b5-ec70-7b43-a2ce-83e3f7fe37b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019ef4b5-ec70-7b43-a2ce-83e3f7fe37b7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_019ef4b5-ec70-7c67-8f63-97bc7abfba73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_019ef4b5-ec70-7c67-8f63-97bc7abfba73" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentNoncontrollingInterestMember_019ef4b5-ec70-7b10-9417-443afca40aef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociDerivativeQualifyingAsHedgeExcludedComponentNoncontrollingInterestMember_019ef4b5-ec70-7b10-9417-443afca40aef" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitNoncontrollingInterestMember_019ef4b5-ec70-7ae9-bed9-3175a1597ac2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitNoncontrollingInterestMember_019ef4b5-ec70-7ae9-bed9-3175a1597ac2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskNoncontrollingInterestMember_019ef4b5-ec70-782f-a2fc-dd1e7ea624d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskNoncontrollingInterestMember_019ef4b5-ec70-782f-a2fc-dd1e7ea624d1" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember_019ef4b5-ec70-7601-98a5-385521d8254e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentAttributableToNoncontrollingInterestMember_019ef4b5-ec70-7601-98a5-385521d8254e" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitIncludingNoncontrollingInterestMember_019ef4b5-ec70-7125-b497-00a9d689f0d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitIncludingNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitIncludingNoncontrollingInterestMember_019ef4b5-ec70-7125-b497-00a9d689f0d2" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskIncludingNoncontrollingInterestMember_019ef4b5-ec70-7517-8a8f-12a4e14a5597" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskIncludingNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskIncludingNoncontrollingInterestMember_019ef4b5-ec70-7517-8a8f-12a4e14a5597" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019ef4b5-ec70-7a63-8bd9-e02da142b470" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b8c-8fb3-b6b6f0f99407" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019ef4b5-ec70-7a63-8bd9-e02da142b470" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ef4b5-ec70-7810-a945-61053b79aa4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019ef4b5-ec70-7b41-8f3f-20ade1d34fa6" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ef4b5-ec70-7810-a945-61053b79aa4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019ef4b5-ec70-77a7-8362-7201acd07cb5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019ef4b5-ec70-7b41-8f3f-20ade1d34fa6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019ef4b5-ec70-77a7-8362-7201acd07cb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019ef4b5-ec70-77eb-9746-6230a92a0811" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019ef4b5-ec70-7b41-8f3f-20ade1d34fa6" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019ef4b5-ec70-77eb-9746-6230a92a0811" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_019ef4b5-ec70-790c-aa71-b6bc64d5c415" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019ef4b5-ec70-7b41-8f3f-20ade1d34fa6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_019ef4b5-ec70-790c-aa71-b6bc64d5c415" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_019ef4b5-ec70-7edc-83b8-30e259a881c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019ef4b5-ec70-7b41-8f3f-20ade1d34fa6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_019ef4b5-ec70-7edc-83b8-30e259a881c0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ef4b5-ec70-7924-bea5-92596877ef38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/RelatedPartiesNarrativeDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#RelatedPartiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/RelatedPartiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_019ef4b5-ec70-7c52-9b67-9af510966d0a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_srt_OwnershipAxis_019ef4b5-ec70-7c52-9b67-9af510966d0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019ef4b5-ec70-7c52-9b67-9af510966d0a_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_019ef4b5-ec70-7c52-9b67-9af510966d0a" xlink:to="loc_srt_OwnershipDomain_019ef4b5-ec70-7c52-9b67-9af510966d0a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019ef4b5-ec70-751e-b2b2-5bc65359e246" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_019ef4b5-ec70-7c52-9b67-9af510966d0a" xlink:to="loc_srt_OwnershipDomain_019ef4b5-ec70-751e-b2b2-5bc65359e246" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AtheneCoInvestReinsuranceAffiliate1ALtd.Member_019ef4b5-ec70-7d77-8cdc-c76d3c50e97a" xlink:href="ahl-20260630.xsd#ahl_AtheneCoInvestReinsuranceAffiliate1ALtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019ef4b5-ec70-751e-b2b2-5bc65359e246" xlink:to="loc_ahl_AtheneCoInvestReinsuranceAffiliate1ALtd.Member_019ef4b5-ec70-7d77-8cdc-c76d3c50e97a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AtheneCoInvestReinsuranceAffiliate2ALtdMember_019ef4b5-ec70-738a-85d5-9784284217ad" xlink:href="ahl-20260630.xsd#ahl_AtheneCoInvestReinsuranceAffiliate2ALtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019ef4b5-ec70-751e-b2b2-5bc65359e246" xlink:to="loc_ahl_AtheneCoInvestReinsuranceAffiliate2ALtdMember_019ef4b5-ec70-738a-85d5-9784284217ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7ea1-8a8f-f40f286d2076" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7ea1-8a8f-f40f286d2076" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7ea1-8a8f-f40f286d2076_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7ea1-8a8f-f40f286d2076" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7ea1-8a8f-f40f286d2076_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7c52-bb10-005f6c317e94" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7ea1-8a8f-f40f286d2076" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7c52-bb10-005f6c317e94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-7ee8-913f-6aaabdcbb96b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7c52-bb10-005f6c317e94" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-7ee8-913f-6aaabdcbb96b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_019ef4b5-ec70-70b0-ad23-dfb53a5b6138" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7c52-bb10-005f6c317e94" xlink:to="loc_srt_ParentCompanyMember_019ef4b5-ec70-70b0-ad23-dfb53a5b6138" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-709e-a121-643415598430" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-709e-a121-643415598430" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-709e-a121-643415598430_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-709e-a121-643415598430" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-709e-a121-643415598430_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-76da-b626-04096baeefdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019ef4b5-ec70-709e-a121-643415598430" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-76da-b626-04096baeefdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivateEquityFundsMember_019ef4b5-ec70-7ec0-9da9-8d814f30ae2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrivateEquityFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019ef4b5-ec70-76da-b626-04096baeefdb" xlink:to="loc_us-gaap_PrivateEquityFundsMember_019ef4b5-ec70-7ec0-9da9-8d814f30ae2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_019ef4b5-ec70-77ca-8188-d4c3c7eb93c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_us-gaap_OtherCommitmentsAxis_019ef4b5-ec70-77ca-8188-d4c3c7eb93c5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019ef4b5-ec70-77ca-8188-d4c3c7eb93c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019ef4b5-ec70-77ca-8188-d4c3c7eb93c5" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019ef4b5-ec70-77ca-8188-d4c3c7eb93c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019ef4b5-ec70-7ac6-8989-589dfacaf322" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019ef4b5-ec70-77ca-8188-d4c3c7eb93c5" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019ef4b5-ec70-7ac6-8989-589dfacaf322" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsMember_019ef4b5-ec70-7631-b9ee-ac9c18bdbaa0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019ef4b5-ec70-7ac6-8989-589dfacaf322" xlink:to="loc_us-gaap_InvestmentsMember_019ef4b5-ec70-7631-b9ee-ac9c18bdbaa0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019ef4b5-ec70-7e46-8f3b-ad021182cbd1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019ef4b5-ec70-7e46-8f3b-ad021182cbd1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-7e46-8f3b-ad021182cbd1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019ef4b5-ec70-7e46-8f3b-ad021182cbd1" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-7e46-8f3b-ad021182cbd1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-7db4-8f23-dca3a2e7ef68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019ef4b5-ec70-7e46-8f3b-ad021182cbd1" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-7db4-8f23-dca3a2e7ef68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-7216-a9e9-80bf027da401" xlink:href="ahl-20260630.xsd#ahl_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-7db4-8f23-dca3a2e7ef68" xlink:to="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-7216-a9e9-80bf027da401" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-758f-b35f-00602fee540b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-758f-b35f-00602fee540b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-758f-b35f-00602fee540b_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-758f-b35f-00602fee540b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-758f-b35f-00602fee540b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-758f-b35f-00602fee540b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ApolloandAffiliatesMember_019ef4b5-ec70-7089-b651-4ed65e982491" xlink:href="ahl-20260630.xsd#ahl_ApolloandAffiliatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_ApolloandAffiliatesMember_019ef4b5-ec70-7089-b651-4ed65e982491" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AthoraHoldingLtd.Member_019ef4b5-ec70-7fab-84bd-c04eaf51275d" xlink:href="ahl-20260630.xsd#ahl_AthoraHoldingLtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_AthoraHoldingLtd.Member_019ef4b5-ec70-7fab-84bd-c04eaf51275d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_VenerableHoldingsInc.Member_019ef4b5-ec70-78a9-98be-0e7968b48c19" xlink:href="ahl-20260630.xsd#ahl_VenerableHoldingsInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_VenerableHoldingsInc.Member_019ef4b5-ec70-78a9-98be-0e7968b48c19" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PKAirFinanceMember_019ef4b5-ec70-7cba-ab20-d980bdfc9b16" xlink:href="ahl-20260630.xsd#ahl_PKAirFinanceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_PKAirFinanceMember_019ef4b5-ec70-7cba-ab20-d980bdfc9b16" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_CatalinaMember_019ef4b5-ec70-7fa3-98da-54ca57fe1326" xlink:href="ahl-20260630.xsd#ahl_CatalinaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_CatalinaMember_019ef4b5-ec70-7fa3-98da-54ca57fe1326" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ApolloGlobalManagementIncMember_019ef4b5-ec70-7d0d-9439-02048b03be47" xlink:href="ahl-20260630.xsd#ahl_ApolloGlobalManagementIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_ApolloGlobalManagementIncMember_019ef4b5-ec70-7d0d-9439-02048b03be47" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AtlasMember_019ef4b5-ec70-724c-8e25-6497e0ca5f14" xlink:href="ahl-20260630.xsd#ahl_AtlasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_AtlasMember_019ef4b5-ec70-724c-8e25-6497e0ca5f14" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_WheelsMember_019ef4b5-ec70-7c03-afc7-da4c6605a78d" xlink:href="ahl-20260630.xsd#ahl_WheelsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_WheelsMember_019ef4b5-ec70-7c03-afc7-da4c6605a78d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AtheneApolloDedicatedInvestmentProgramMember_019ef4b5-ec70-774f-8899-d1d55e3d0b03" xlink:href="ahl-20260630.xsd#ahl_AtheneApolloDedicatedInvestmentProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_AtheneApolloDedicatedInvestmentProgramMember_019ef4b5-ec70-774f-8899-d1d55e3d0b03" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_APVioletATHHoldingsLPMember_019ef4b5-ec70-7861-996e-caac3e5077f2" xlink:href="ahl-20260630.xsd#ahl_APVioletATHHoldingsLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_APVioletATHHoldingsLPMember_019ef4b5-ec70-7861-996e-caac3e5077f2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ApolloCommercialRealEstateFinanceIncMember_019fb8a4-7249-7df4-b8ec-ee6e40815411" xlink:href="ahl-20260630.xsd#ahl_ApolloCommercialRealEstateFinanceIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-74b2-a5ff-be477614118c" xlink:to="loc_ahl_ApolloCommercialRealEstateFinanceIncMember_019fb8a4-7249-7df4-b8ec-ee6e40815411" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec70-7e05-9e37-1f723bad07f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec70-7e05-9e37-1f723bad07f1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7e05-9e37-1f723bad07f1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec70-7e05-9e37-1f723bad07f1" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7e05-9e37-1f723bad07f1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7169-9303-aa58cd14802e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ef4b5-ec70-7e05-9e37-1f723bad07f1" xlink:to="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7169-9303-aa58cd14802e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-70b9-8c56-125bb4f7b0bd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7169-9303-aa58cd14802e" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-70b9-8c56-125bb4f7b0bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SuballocatedassetsMember_019ef4b5-ec70-772a-9eb5-6269a804e1f2" xlink:href="ahl-20260630.xsd#ahl_SuballocatedassetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7169-9303-aa58cd14802e" xlink:to="loc_ahl_SuballocatedassetsMember_019ef4b5-ec70-772a-9eb5-6269a804e1f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ContingentInvestmentFeesMember_019ef4b5-ec70-75f6-8a62-735e1080d30b" xlink:href="ahl-20260630.xsd#ahl_ContingentInvestmentFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ef4b5-ec70-7169-9303-aa58cd14802e" xlink:to="loc_ahl_ContingentInvestmentFeesMember_019ef4b5-ec70-75f6-8a62-735e1080d30b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019ef4b5-ec70-79f9-9af8-4fa6dde4774b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019ef4b5-ec70-79f9-9af8-4fa6dde4774b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019ef4b5-ec70-79f9-9af8-4fa6dde4774b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019ef4b5-ec70-79f9-9af8-4fa6dde4774b" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019ef4b5-ec70-79f9-9af8-4fa6dde4774b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019ef4b5-ec70-7ee7-9feb-2c735fd6ec98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019ef4b5-ec70-79f9-9af8-4fa6dde4774b" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019ef4b5-ec70-7ee7-9feb-2c735fd6ec98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ManagementFeesAssociatedwithInvestmentFundsMember_019ef4b5-ec70-7d49-a44a-6b3094dc6b16" xlink:href="ahl-20260630.xsd#ahl_ManagementFeesAssociatedwithInvestmentFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019ef4b5-ec70-7ee7-9feb-2c735fd6ec98" xlink:to="loc_ahl_ManagementFeesAssociatedwithInvestmentFundsMember_019ef4b5-ec70-7d49-a44a-6b3094dc6b16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_MidCapAffiliatesMember_019ef4b5-ec70-7a23-85c6-5f7b118eeea2" xlink:href="ahl-20260630.xsd#ahl_MidCapAffiliatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019ef4b5-ec70-7ee7-9feb-2c735fd6ec98" xlink:to="loc_ahl_MidCapAffiliatesMember_019ef4b5-ec70-7a23-85c6-5f7b118eeea2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PerformanceFeeTargetMember_019ef4b5-ec70-72e4-ad5b-d29cd593dd8e" xlink:href="ahl-20260630.xsd#ahl_PerformanceFeeTargetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019ef4b5-ec70-7ee7-9feb-2c735fd6ec98" xlink:to="loc_ahl_PerformanceFeeTargetMember_019ef4b5-ec70-72e4-ad5b-d29cd593dd8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SubAdvisoryAndOtherFeesIncurredForTheBenefitForThirdPartyServiceProvidersMember_019ef4b5-ec70-7184-bed6-fa84f4884338" xlink:href="ahl-20260630.xsd#ahl_SubAdvisoryAndOtherFeesIncurredForTheBenefitForThirdPartyServiceProvidersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019ef4b5-ec70-7ee7-9feb-2c735fd6ec98" xlink:to="loc_ahl_SubAdvisoryAndOtherFeesIncurredForTheBenefitForThirdPartyServiceProvidersMember_019ef4b5-ec70-7184-bed6-fa84f4884338" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019ef4b5-ec70-77e4-b6fb-b72d7d4584b2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_srt_RangeAxis_019ef4b5-ec70-77e4-b6fb-b72d7d4584b2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ef4b5-ec70-77e4-b6fb-b72d7d4584b2_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019ef4b5-ec70-77e4-b6fb-b72d7d4584b2" xlink:to="loc_srt_RangeMember_019ef4b5-ec70-77e4-b6fb-b72d7d4584b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019ef4b5-ec70-78e0-8b32-0f149cd22839" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019ef4b5-ec70-77e4-b6fb-b72d7d4584b2" xlink:to="loc_srt_RangeMember_019ef4b5-ec70-78e0-8b32-0f149cd22839" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019ef4b5-ec70-720d-86e5-e69fe26d2c3f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ef4b5-ec70-78e0-8b32-0f149cd22839" xlink:to="loc_srt_MinimumMember_019ef4b5-ec70-720d-86e5-e69fe26d2c3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019ef4b5-ec70-7aa3-8755-dd01f5a8ae06" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019ef4b5-ec70-78e0-8b32-0f149cd22839" xlink:to="loc_srt_MaximumMember_019ef4b5-ec70-7aa3-8755-dd01f5a8ae06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-7b13-831c-fe6f26dba312" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-7b13-831c-fe6f26dba312" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b13-831c-fe6f26dba312_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-7b13-831c-fe6f26dba312" xlink:to="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7b13-831c-fe6f26dba312_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7225-8d97-f453492816b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-7b13-831c-fe6f26dba312" xlink:to="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7225-8d97-f453492816b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019ef4b5-ec70-759b-88e1-c09b4703ddfa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7225-8d97-f453492816b4" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019ef4b5-ec70-759b-88e1-c09b4703ddfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019ef4b5-ec70-779b-a06e-854916f27797" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_us-gaap_CreditFacilityAxis_019ef4b5-ec70-779b-a06e-854916f27797" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019ef4b5-ec70-779b-a06e-854916f27797_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019ef4b5-ec70-779b-a06e-854916f27797" xlink:to="loc_us-gaap_CreditFacilityDomain_019ef4b5-ec70-779b-a06e-854916f27797_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019ef4b5-ec70-7cd5-a217-7b7f83158475" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019ef4b5-ec70-779b-a06e-854916f27797" xlink:to="loc_us-gaap_CreditFacilityDomain_019ef4b5-ec70-7cd5-a217-7b7f83158475" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019ef4b5-ec70-7333-93d5-08a7438e1807" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019ef4b5-ec70-7cd5-a217-7b7f83158475" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019ef4b5-ec70-7333-93d5-08a7438e1807" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskAxis_019ef4b5-ec70-7b38-9c81-b245c4f4018f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CededCreditRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7d14-a436-42577f334949" xlink:to="loc_us-gaap_CededCreditRiskAxis_019ef4b5-ec70-7b38-9c81-b245c4f4018f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_019ef4b5-ec70-7b38-9c81-b245c4f4018f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CededCreditRiskAxis_019ef4b5-ec70-7b38-9c81-b245c4f4018f" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_019ef4b5-ec70-7b38-9c81-b245c4f4018f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_019ef4b5-ec70-7f72-b081-5413bc444268" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CededCreditRiskAxis_019ef4b5-ec70-7b38-9c81-b245c4f4018f" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_019ef4b5-ec70-7f72-b081-5413bc444268" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_CatalinaMember_019ef4b5-ec70-7c6a-95cd-d9c44020f2a7" xlink:href="ahl-20260630.xsd#ahl_CatalinaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_019ef4b5-ec70-7f72-b081-5413bc444268" xlink:to="loc_ahl_CatalinaMember_019ef4b5-ec70-7c6a-95cd-d9c44020f2a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_BaseManagementFee_019ef4b5-ec70-7473-875c-47592ebc635c" xlink:href="ahl-20260630.xsd#ahl_BaseManagementFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_BaseManagementFee_019ef4b5-ec70-7473-875c-47592ebc635c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_BackbookValue_019ef4b5-ec70-7369-a5c2-66044bb1ef4f" xlink:href="ahl-20260630.xsd#ahl_BackbookValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_BackbookValue_019ef4b5-ec70-7369-a5c2-66044bb1ef4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_IncrementalFee_019ef4b5-ec70-70a0-bc76-8de01d68ceec" xlink:href="ahl-20260630.xsd#ahl_IncrementalFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_IncrementalFee_019ef4b5-ec70-70a0-bc76-8de01d68ceec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_Suballocationfeepercentage_019ef4b5-ec70-795c-ad08-a6088373c928" xlink:href="ahl-20260630.xsd#ahl_Suballocationfeepercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_Suballocationfeepercentage_019ef4b5-ec70-795c-ad08-a6088373c928" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019ef4b5-ec70-7c58-8830-9dd60f00bf00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019ef4b5-ec70-7c58-8830-9dd60f00bf00" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_PerformanceFeeTargetPercent_019ef4b5-ec70-74b1-bb0a-4d5580e580ef" xlink:href="ahl-20260630.xsd#ahl_PerformanceFeeTargetPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_PerformanceFeeTargetPercent_019ef4b5-ec70-74b1-bb0a-4d5580e580ef" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019ef4b5-ec70-70e9-9034-dd7533fa940b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_OtherLiabilities_019ef4b5-ec70-70e9-9034-dd7533fa940b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ManagementFeePercent_019ef4b5-ec70-71ec-a026-6192462f61a3" xlink:href="ahl-20260630.xsd#ahl_ManagementFeePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_ManagementFeePercent_019ef4b5-ec70-71ec-a026-6192462f61a3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_NumberOfBoardOfDirectorsThatAreEmployeesOfCompany_019ef4b5-ec70-7b49-9db5-7af889c8a382" xlink:href="ahl-20260630.xsd#ahl_NumberOfBoardOfDirectorsThatAreEmployeesOfCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_NumberOfBoardOfDirectorsThatAreEmployeesOfCompany_019ef4b5-ec70-7b49-9db5-7af889c8a382" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_NumberOfDirectorsOnBoard_019ef4b5-ec70-7ed3-8bc1-d59d88be23e0" xlink:href="ahl-20260630.xsd#ahl_NumberOfDirectorsOnBoard"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_NumberOfDirectorsOnBoard_019ef4b5-ec70-7ed3-8bc1-d59d88be23e0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-ec70-78cd-93d9-5d3a50c9e4ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderContractDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-ec70-78cd-93d9-5d3a50c9e4ee" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-ec70-7529-b916-962797a363ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-ec70-7529-b916-962797a363ff" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_019ef4b5-ec70-7668-a612-f67360d38b96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_OtherCommitment_019ef4b5-ec70-7668-a612-f67360d38b96" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019ef4b5-ec70-7b0e-af4f-2888fd7d6d81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_Investments_019ef4b5-ec70-7b0e-af4f-2888fd7d6d81" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_019ef4b5-ec70-7478-b5ee-e87317cfe277" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_ReinsuranceRecoverables_019ef4b5-ec70-7478-b5ee-e87317cfe277" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecurities_019ef4b5-ec70-70f5-ad29-346a7af4b3d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_DebtSecurities_019ef4b5-ec70-70f5-ad29-346a7af4b3d1" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019ef4b5-ec70-720e-b43e-8af3265a4454" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_EquityMethodInvestments_019ef4b5-ec70-720e-b43e-8af3265a4454" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_019ef4b5-ec70-7563-b238-177837593d5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_019ef4b5-ec70-7563-b238-177837593d5d" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_019ef4b5-ec70-78bc-850b-70e266adc7fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_019ef4b5-ec70-78bc-850b-70e266adc7fe" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFunds_019ef4b5-ec70-7173-9f3f-253a34ab43b9" xlink:href="ahl-20260630.xsd#ahl_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_InvestmentFunds_019ef4b5-ec70-7173-9f3f-253a34ab43b9" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019ef4b5-ec70-77ce-a6ec-df26b21f4560" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_OtherInvestments_019ef4b5-ec70-77ce-a6ec-df26b21f4560" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_Revolvingnotereceivableborrowingcapacity_019ef4b5-ec70-791f-ac22-f5c46542a535" xlink:href="ahl-20260630.xsd#ahl_Revolvingnotereceivableborrowingcapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_Revolvingnotereceivableborrowingcapacity_019ef4b5-ec70-791f-ac22-f5c46542a535" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_IntercompanyNoteReceivable_019ef4b5-ec70-7307-9755-2cd7c351c8ac" xlink:href="ahl-20260630.xsd#ahl_IntercompanyNoteReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_ahl_IntercompanyNoteReceivable_019ef4b5-ec70-7307-9755-2cd7c351c8ac" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019ef4b5-ec70-77d5-ba6e-04b502905848" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019ef4b5-ec70-77d5-ba6e-04b502905848" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019ef4b5-ec70-7ac6-b202-194d8a41c0b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_LineOfCredit_019ef4b5-ec70-7ac6-b202-194d8a41c0b1" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_019feb3e-673b-7545-808d-3de97692dd4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7bb0-9ce6-f3e447588bfd" xlink:to="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_019feb3e-673b-7545-808d-3de97692dd4a" xlink:type="arc" order="25"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/RelatedPartiesSummaryofInvestmentsAthoraDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#RelatedPartiesSummaryofInvestmentsAthoraDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/RelatedPartiesSummaryofInvestmentsAthoraDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7b47-afd8-8fa3153e0222" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-776a-b899-22608590611c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7b47-afd8-8fa3153e0222" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-776a-b899-22608590611c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-78f8-97e7-b0141476c144" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-776a-b899-22608590611c" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-78f8-97e7-b0141476c144" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-78f8-97e7-b0141476c144_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-78f8-97e7-b0141476c144" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-78f8-97e7-b0141476c144_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7929-9a80-86ec29242375" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-78f8-97e7-b0141476c144" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7929-9a80-86ec29242375" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-734f-a072-44a7edd7dfcb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7929-9a80-86ec29242375" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-734f-a072-44a7edd7dfcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-765a-ae3f-61f98ab18550" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-776a-b899-22608590611c" xlink:to="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-765a-ae3f-61f98ab18550" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-765a-ae3f-61f98ab18550_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-765a-ae3f-61f98ab18550" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-765a-ae3f-61f98ab18550_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-73d3-844c-90b4934bcaf7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-765a-ae3f-61f98ab18550" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-73d3-844c-90b4934bcaf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AthoraHoldingLtd.Member_019ef4b5-ec70-7dae-a974-e79077b35113" xlink:href="ahl-20260630.xsd#ahl_AthoraHoldingLtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-73d3-844c-90b4934bcaf7" xlink:to="loc_ahl_AthoraHoldingLtd.Member_019ef4b5-ec70-7dae-a974-e79077b35113" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec70-7326-880e-dfa648ca0003" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-776a-b899-22608590611c" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec70-7326-880e-dfa648ca0003" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-7326-880e-dfa648ca0003_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec70-7326-880e-dfa648ca0003" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-7326-880e-dfa648ca0003_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-768e-9f0c-4f8f548d58ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019ef4b5-ec70-7326-880e-dfa648ca0003" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-768e-9f0c-4f8f548d58ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec70-7039-8c3a-a4d29c9d57c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019ef4b5-ec70-768e-9f0c-4f8f548d58ec" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019ef4b5-ec70-7039-8c3a-a4d29c9d57c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFunds_019ef4b5-ec70-7421-b267-07f827870924" xlink:href="ahl-20260630.xsd#ahl_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7b47-afd8-8fa3153e0222" xlink:to="loc_ahl_InvestmentFunds_019ef4b5-ec70-7421-b267-07f827870924" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecurities_019ef4b5-ec70-7b21-bdd5-2cf2d556602e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7b47-afd8-8fa3153e0222" xlink:to="loc_us-gaap_DebtSecurities_019ef4b5-ec70-7b21-bdd5-2cf2d556602e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019ef4b5-ec70-7a55-bec4-f881dfecaf31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7b47-afd8-8fa3153e0222" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent_019ef4b5-ec70-7a55-bec4-f881dfecaf31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019ef4b5-ec70-79bd-a54e-10b99b183fdf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7b47-afd8-8fa3153e0222" xlink:to="loc_us-gaap_Investments_019ef4b5-ec70-79bd-a54e-10b99b183fdf" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/RelatedPartiesSummaryofInvestmentsVACapitalandVenerableDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#RelatedPartiesSummaryofInvestmentsVACapitalandVenerableDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/RelatedPartiesSummaryofInvestmentsVACapitalandVenerableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-735e-b941-dd9f8a230d7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-73f3-a7ad-39732ea6d83c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-735e-b941-dd9f8a230d7a" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-73f3-a7ad-39732ea6d83c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7bc0-82a0-bbce15aa5d85" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-73f3-a7ad-39732ea6d83c" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7bc0-82a0-bbce15aa5d85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7bc0-82a0-bbce15aa5d85_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7bc0-82a0-bbce15aa5d85" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7bc0-82a0-bbce15aa5d85_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7c1e-bb03-4af7646cae29" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-7bc0-82a0-bbce15aa5d85" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7c1e-bb03-4af7646cae29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-7aef-8e8e-912ddaa0ee9e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7c1e-bb03-4af7646cae29" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-7aef-8e8e-912ddaa0ee9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-7ef3-98f8-7e0b4377a4db" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-73f3-a7ad-39732ea6d83c" xlink:to="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-7ef3-98f8-7e0b4377a4db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7ef3-98f8-7e0b4377a4db_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-7ef3-98f8-7e0b4377a4db" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7ef3-98f8-7e0b4377a4db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7bc9-bf84-18dc915b3370" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-7ef3-98f8-7e0b4377a4db" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7bc9-bf84-18dc915b3370" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_VenerableHoldingsInc.Member_019ef4b5-ec70-7810-a832-ce26fe2bf778" xlink:href="ahl-20260630.xsd#ahl_VenerableHoldingsInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7bc9-bf84-18dc915b3370" xlink:to="loc_ahl_VenerableHoldingsInc.Member_019ef4b5-ec70-7810-a832-ce26fe2bf778" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-ec70-7ca5-bc14-009b66691a39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-735e-b941-dd9f8a230d7a" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019ef4b5-ec70-7ca5-bc14-009b66691a39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFunds_019ef4b5-ec70-7806-a806-1df41b62df35" xlink:href="ahl-20260630.xsd#ahl_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-735e-b941-dd9f8a230d7a" xlink:to="loc_ahl_InvestmentFunds_019ef4b5-ec70-7806-a806-1df41b62df35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019ef4b5-ec70-7940-a05f-4d430744a334" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-735e-b941-dd9f8a230d7a" xlink:to="loc_us-gaap_OtherInvestments_019ef4b5-ec70-7940-a05f-4d430744a334" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019ef4b5-ec70-776b-81d7-c6cde6ee559d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-735e-b941-dd9f8a230d7a" xlink:to="loc_us-gaap_Investments_019ef4b5-ec70-776b-81d7-c6cde6ee559d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/RelatedPartiesNoncontrollingInterestsDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#RelatedPartiesNoncontrollingInterestsDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/RelatedPartiesNoncontrollingInterestsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7154-b90c-08040a2ca80e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7441-9723-c4abba39ea96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7154-b90c-08040a2ca80e" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7441-9723-c4abba39ea96" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-77b0-8084-6ac0ac33f744" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ef4b5-ec70-7441-9723-c4abba39ea96" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-77b0-8084-6ac0ac33f744" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-77b0-8084-6ac0ac33f744_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-77b0-8084-6ac0ac33f744" xlink:to="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-77b0-8084-6ac0ac33f744_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7717-bfda-3bbf0fe55cae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019ef4b5-ec70-77b0-8084-6ac0ac33f744" xlink:to="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7717-bfda-3bbf0fe55cae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019ef4b5-ec70-70db-b9ec-877b0759687c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019ef4b5-ec70-7717-bfda-3bbf0fe55cae" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019ef4b5-ec70-70db-b9ec-877b0759687c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_NoncontrollingInterestsIncreaseFromContributionsFromNoncontrollingInterests_019ef4b5-ec70-7a8d-8820-103505681662" xlink:href="ahl-20260630.xsd#ahl_NoncontrollingInterestsIncreaseFromContributionsFromNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7154-b90c-08040a2ca80e" xlink:to="loc_ahl_NoncontrollingInterestsIncreaseFromContributionsFromNoncontrollingInterests_019ef4b5-ec70-7a8d-8820-103505681662" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019ef4b5-ec70-7380-bd62-f2e40ae6895f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ef4b5-ec70-7154-b90c-08040a2ca80e" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019ef4b5-ec70-7380-bd62-f2e40ae6895f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_019ef4b5-ec70-7a07-ab32-870d6d1703e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:to="loc_us-gaap_OtherCommitmentsTable_019ef4b5-ec70-7a07-ab32-870d6d1703e5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_019ef4b5-ec70-7919-86db-c129108f1852" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_019ef4b5-ec70-7a07-ab32-870d6d1703e5" xlink:to="loc_us-gaap_OtherCommitmentsAxis_019ef4b5-ec70-7919-86db-c129108f1852" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019ef4b5-ec70-7919-86db-c129108f1852_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019ef4b5-ec70-7919-86db-c129108f1852" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019ef4b5-ec70-7919-86db-c129108f1852_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019ef4b5-ec70-7459-8095-3e7e9b28a31d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019ef4b5-ec70-7919-86db-c129108f1852" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019ef4b5-ec70-7459-8095-3e7e9b28a31d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsMember_019ef4b5-ec70-7a0f-8585-ae317a45b40c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019ef4b5-ec70-7459-8095-3e7e9b28a31d" xlink:to="loc_us-gaap_InvestmentsMember_019ef4b5-ec70-7a0f-8585-ae317a45b40c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-7957-9991-f76b4f7682c4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_019ef4b5-ec70-7a07-ab32-870d6d1703e5" xlink:to="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-7957-9991-f76b4f7682c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7957-9991-f76b4f7682c4_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-7957-9991-f76b4f7682c4" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7957-9991-f76b4f7682c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7041-9814-1026b8543729" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019ef4b5-ec70-7957-9991-f76b4f7682c4" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7041-9814-1026b8543729" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_AtheneGlobalFundingMember_019ef4b5-ec70-7cce-a8c3-532f81468d0e" xlink:href="ahl-20260630.xsd#ahl_AtheneGlobalFundingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7041-9814-1026b8543729" xlink:to="loc_ahl_AtheneGlobalFundingMember_019ef4b5-ec70-7cce-a8c3-532f81468d0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FABRProgramMember_019ef4b5-ec70-7abb-ae35-7207ad5e787c" xlink:href="ahl-20260630.xsd#ahl_FABRProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019ef4b5-ec70-7041-9814-1026b8543729" xlink:to="loc_ahl_FABRProgramMember_019ef4b5-ec70-7abb-ae35-7207ad5e787c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019ef4b5-ec70-75c0-a782-029e965142bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_019ef4b5-ec70-7a07-ab32-870d6d1703e5" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019ef4b5-ec70-75c0-a782-029e965142bf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-75c0-a782-029e965142bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019ef4b5-ec70-75c0-a782-029e965142bf" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-75c0-a782-029e965142bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-79d5-88ce-86ed7969204f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_019ef4b5-ec70-75c0-a782-029e965142bf" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-79d5-88ce-86ed7969204f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-7178-9708-8e9bacf70a0c" xlink:href="ahl-20260630.xsd#ahl_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-79d5-88ce-86ed7969204f" xlink:to="loc_ahl_FundingAgreementsMember_019ef4b5-ec70-7178-9708-8e9bacf70a0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_SecuredFundingAgreementsMember_019ef4b5-ec70-7896-bce1-1b080cc77458" xlink:href="ahl-20260630.xsd#ahl_SecuredFundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-79d5-88ce-86ed7969204f" xlink:to="loc_ahl_SecuredFundingAgreementsMember_019ef4b5-ec70-7896-bce1-1b080cc77458" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_DirectFundingAgreementsMember_019ef4b5-ec70-7b89-9a18-5548f5f4f8ee" xlink:href="ahl-20260630.xsd#ahl_DirectFundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_019ef4b5-ec70-79d5-88ce-86ed7969204f" xlink:to="loc_ahl_DirectFundingAgreementsMember_019ef4b5-ec70-7b89-9a18-5548f5f4f8ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-702a-936c-802c11cdfced" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_019ef4b5-ec70-7a07-ab32-870d6d1703e5" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-702a-936c-802c11cdfced" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-702a-936c-802c11cdfced_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-702a-936c-802c11cdfced" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-702a-936c-802c11cdfced_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7cd9-9d48-d858d6d22685" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019ef4b5-ec70-702a-936c-802c11cdfced" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7cd9-9d48-d858d6d22685" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-7570-b8c5-1c9b4ae3aab5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019ef4b5-ec70-7cd9-9d48-d858d6d22685" xlink:to="loc_srt_AffiliatedEntityMember_019ef4b5-ec70-7570-b8c5-1c9b4ae3aab5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_019fb8ef-e5e8-7e9e-bccd-30823a66ebce" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_019ef4b5-ec70-7a07-ab32-870d6d1703e5" xlink:to="loc_srt_OwnershipAxis_019fb8ef-e5e8-7e9e-bccd-30823a66ebce" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019fb8ef-e5e8-7e9e-bccd-30823a66ebce_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_019fb8ef-e5e8-7e9e-bccd-30823a66ebce" xlink:to="loc_srt_OwnershipDomain_019fb8ef-e5e8-7e9e-bccd-30823a66ebce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019fb8ef-e5e8-75bd-8951-7d1dc3865539" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_019fb8ef-e5e8-7e9e-bccd-30823a66ebce" xlink:to="loc_srt_OwnershipDomain_019fb8ef-e5e8-75bd-8951-7d1dc3865539" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_TotalArrangementIncludingAtheneAndThirdPartiesMember_019fb8f1-b70e-70d1-88fc-0d3227e30611" xlink:href="ahl-20260630.xsd#ahl_TotalArrangementIncludingAtheneAndThirdPartiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019fb8ef-e5e8-75bd-8951-7d1dc3865539" xlink:to="loc_ahl_TotalArrangementIncludingAtheneAndThirdPartiesMember_019fb8f1-b70e-70d1-88fc-0d3227e30611" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_019ef4b5-ec70-7cc2-a903-8038db29cd20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:to="loc_us-gaap_OtherCommitment_019ef4b5-ec70-7cc2-a903-8038db29cd20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentPeriodForCommitments_019ef4b5-ec70-7bc0-b597-5866b4e7830b" xlink:href="ahl-20260630.xsd#ahl_InvestmentPeriodForCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:to="loc_ahl_InvestmentPeriodForCommitments_019ef4b5-ec70-7bc0-b597-5866b4e7830b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvancesFromFederalHomeLoanBanks_019ef4b5-ec70-762d-bdee-e11be69e72e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdvancesFromFederalHomeLoanBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:to="loc_us-gaap_AdvancesFromFederalHomeLoanBanks_019ef4b5-ec70-762d-bdee-e11be69e72e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-ec70-711e-a78c-6ff74ce37c09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PolicyholderContractDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:to="loc_us-gaap_PolicyholderContractDeposits_019ef4b5-ec70-711e-a78c-6ff74ce37c09" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019ef4b5-ec70-76bc-8498-ff30e81ae22f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019ef4b5-ec70-76bc-8498-ff30e81ae22f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019ef4b5-ec70-7dc3-b5b6-143dd5b6b3f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019ef4b5-ec70-7dc3-b5b6-143dd5b6b3f2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_019ef4b5-ec70-7a5b-bd6b-8e56b568b132" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_019ef4b5-ec70-7a5b-bd6b-8e56b568b132" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_CapitalSolutionAgreementTotal_019fba33-051b-7611-91fb-2a4f3098dba4" xlink:href="ahl-20260630.xsd#ahl_CapitalSolutionAgreementTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:to="loc_ahl_CapitalSolutionAgreementTotal_019fba33-051b-7611-91fb-2a4f3098dba4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_GuaranteePercentageOfTotalCapitalSolution_019fba37-ed59-7f9c-85ff-6aa680e5be9e" xlink:href="ahl-20260630.xsd#ahl_GuaranteePercentageOfTotalCapitalSolution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-766f-a9d9-05edebb00c8b" xlink:to="loc_ahl_GuaranteePercentageOfTotalCapitalSolution_019fba37-ed59-7f9c-85ff-6aa680e5be9e" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/CommitmentsandContingenciesPledgedAssetsandFundsinTrustDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#CommitmentsandContingenciesPledgedAssetsandFundsinTrustDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/CommitmentsandContingenciesPledgedAssetsandFundsinTrustDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_019ef4b5-ec70-744a-83d1-9ed87602a04e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_us-gaap_OtherCommitmentsTable_019ef4b5-ec70-744a-83d1-9ed87602a04e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_019ef4b5-ec70-7be7-ba05-9e8dc405648e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_019ef4b5-ec70-744a-83d1-9ed87602a04e" xlink:to="loc_us-gaap_PledgedStatusAxis_019ef4b5-ec70-7be7-ba05-9e8dc405648e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_019ef4b5-ec70-7be7-ba05-9e8dc405648e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_019ef4b5-ec70-7be7-ba05-9e8dc405648e" xlink:to="loc_us-gaap_PledgedStatusDomain_019ef4b5-ec70-7be7-ba05-9e8dc405648e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_019ef4b5-ec70-7209-aa49-8d43be757dbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_019ef4b5-ec70-7be7-ba05-9e8dc405648e" xlink:to="loc_us-gaap_PledgedStatusDomain_019ef4b5-ec70-7209-aa49-8d43be757dbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_019ef4b5-ec70-7f82-a52d-3254b70bd67a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_019ef4b5-ec70-7209-aa49-8d43be757dbc" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_019ef4b5-ec70-7f82-a52d-3254b70bd67a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRestricted_019ef4b5-ec70-7815-861a-e0920f944f45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleRestricted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRestricted_019ef4b5-ec70-7815-861a-e0920f944f45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesTradingRestricted_019ef4b5-ec70-723b-a8ad-cedb3bf95a72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesTradingRestricted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_us-gaap_DebtSecuritiesTradingRestricted_019ef4b5-ec70-723b-a8ad-cedb3bf95a72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiRestricted_019ef4b5-ec70-7a72-a11c-c7e0943cc653" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNiRestricted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_us-gaap_EquitySecuritiesFvNiRestricted_019ef4b5-ec70-7a72-a11c-c7e0943cc653" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-ec70-7013-b78d-e7b7a4445dde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet_019ef4b5-ec70-7013-b78d-e7b7a4445dde" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InvestmentFunds_019ef4b5-ec70-7ebb-819c-4449ef37144f" xlink:href="ahl-20260630.xsd#ahl_InvestmentFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_ahl_InvestmentFunds_019ef4b5-ec70-7ebb-819c-4449ef37144f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019ef4b5-ec70-7ead-8c05-4a4f8b1513bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_us-gaap_DerivativeAssets_019ef4b5-ec70-7ead-8c05-4a4f8b1513bb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019ef4b5-ec70-73fe-998d-39aeed0eef72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_us-gaap_ShortTermInvestments_019ef4b5-ec70-73fe-998d-39aeed0eef72" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_019ef4b5-ec70-7188-9451-17bfe3c3a9c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_us-gaap_OtherInvestments_019ef4b5-ec70-7188-9451-17bfe3c3a9c1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019ef4b5-ec70-748b-837d-cf4f9ebdf07c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019ef4b5-ec70-748b-837d-cf4f9ebdf07c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndInvestments_019ef4b5-ec70-7910-99b5-271e843dbdd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019ef4b5-ec70-7fd8-be3f-9b638fe6edc7" xlink:to="loc_us-gaap_RestrictedCashAndInvestments_019ef4b5-ec70-7910-99b5-271e843dbdd4" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.athene.com/role/SegmentReportingDetails" xlink:type="simple" xlink:href="ahl-20260630.xsd#SegmentReportingDetails"/>
  <link:definitionLink xlink:role="http://www.athene.com/role/SegmentReportingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019fd8bc-3b16-717d-9c98-dda6c22ea0b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019fd8bc-3b16-717d-9c98-dda6c22ea0b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019fd8bc-3b16-7471-8829-a859ccf273b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019fd8bc-3b16-717d-9c98-dda6c22ea0b5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019fd8bc-3b16-7471-8829-a859ccf273b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019fd8bc-3b16-7471-8829-a859ccf273b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019fd8bc-3b16-7471-8829-a859ccf273b2" xlink:to="loc_us-gaap_SegmentDomain_019fd8bc-3b16-7471-8829-a859ccf273b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019fd8bc-3b16-7372-b93b-9bd98e9f8dcc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019fd8bc-3b16-7471-8829-a859ccf273b2" xlink:to="loc_us-gaap_SegmentDomain_019fd8bc-3b16-7372-b93b-9bd98e9f8dcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_ReportableSegmentMember_019fd8bd-002f-7138-96aa-51af1544ba15" xlink:href="ahl-20260630.xsd#ahl_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019fd8bc-3b16-7372-b93b-9bd98e9f8dcc" xlink:to="loc_ahl_ReportableSegmentMember_019fd8bd-002f-7138-96aa-51af1544ba15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019fd8bc-3b16-7d40-b93f-0b5b3347749b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_us-gaap_Revenues_019fd8bc-3b16-7d40-b93f-0b5b3347749b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_CostOfFunds_019fd8bc-3b16-7597-9bec-3112e95df3af" xlink:href="ahl-20260630.xsd#ahl_CostOfFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_ahl_CostOfFunds_019fd8bc-3b16-7597-9bec-3112e95df3af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherOperatingExpenses_019fd8bc-3b16-7eb6-a9bb-d527a7f1c17d" xlink:href="ahl-20260630.xsd#ahl_OtherOperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_ahl_OtherOperatingExpenses_019fd8bc-3b16-7eb6-a9bb-d527a7f1c17d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_InterestAndOtherFinancingCosts_019fd8bc-3b16-7f2d-bd63-44741252acd2" xlink:href="ahl-20260630.xsd#ahl_InterestAndOtherFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_ahl_InterestAndOtherFinancingCosts_019fd8bc-3b16-7f2d-bd63-44741252acd2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherLiabilityCostsEqualToPremiumAmount_019fddea-4cf9-73bd-a73c-27dab10b0822" xlink:href="ahl-20260630.xsd#ahl_OtherLiabilityCostsEqualToPremiumAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_ahl_OtherLiabilityCostsEqualToPremiumAmount_019fddea-4cf9-73bd-a73c-27dab10b0822" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_019fd8bc-3b16-7d22-90de-7305040cb666" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_us-gaap_PremiumsEarnedNet_019fd8bc-3b16-7d22-90de-7305040cb666" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahl_OtherSegmentItems_019fd8bc-3b16-792b-8717-923a02d4f472" xlink:href="ahl-20260630.xsd#ahl_OtherSegmentItems"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_ahl_OtherSegmentItems_019fd8bc-3b16-792b-8717-923a02d4f472" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd8bc-3b16-7483-bf54-5e9a8046e8dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019fd8bc-3b16-7483-bf54-5e9a8046e8dd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019fd8bc-3b16-7e65-98ce-e11fd6089d4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019fd8bc-3b16-7e65-98ce-e11fd6089d4a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019fd8bc-3b16-74b2-b915-3d27004e54fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019fd8bc-3b16-7f4f-bee9-eef55070b1da" xlink:to="loc_us-gaap_ProfitLoss_019fd8bc-3b16-74b2-b915-3d27004e54fa" xlink:type="arc" order="9"/>
  </link:definitionLink>
</link:linkbase>
