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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019eadcc-a3a3-7932-a439-d95789a5eb30,g:977aa196-3dac-4297-9497-ff4e8912580c-->
<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.umw.com/role/Cover" xlink:type="simple" xlink:href="uwmc-20260630.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019eadcc-a5d1-717d-9a44-7e1b9ec96a41" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_DocumentInformationTable_019eadcc-a5d1-717d-9a44-7e1b9ec96a41" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a5d1-7d9d-b3f9-afb5c4795f54" 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_019eadcc-a5d1-717d-9a44-7e1b9ec96a41" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a5d1-7d9d-b3f9-afb5c4795f54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7d9d-b3f9-afb5c4795f54_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_019eadcc-a5d1-7d9d-b3f9-afb5c4795f54" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7d9d-b3f9-afb5c4795f54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-76c2-821a-9d48702fb3e6" 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_019eadcc-a5d1-7d9d-b3f9-afb5c4795f54" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-76c2-821a-9d48702fb3e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019eadcc-a5d1-70c6-aaf9-b3d4d0133050" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-76c2-821a-9d48702fb3e6" xlink:to="loc_us-gaap_CommonClassAMember_019eadcc-a5d1-70c6-aaf9-b3d4d0133050" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_CommonClassDMember_019eadcc-a5d1-7e1f-9d86-24b613b11fb6" xlink:href="uwmc-20260630.xsd#uwmc_CommonClassDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-76c2-821a-9d48702fb3e6" xlink:to="loc_uwmc_CommonClassDMember_019eadcc-a5d1-7e1f-9d86-24b613b11fb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019eadcc-a5d1-7023-bd0f-e360162fd7eb" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_DocumentType_019eadcc-a5d1-7023-bd0f-e360162fd7eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019eadcc-a5d1-7de5-a1de-70ca195c7f24" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_DocumentQuarterlyReport_019eadcc-a5d1-7de5-a1de-70ca195c7f24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019eadcc-a5d1-7b20-b9f0-d7bbac81fb34" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_DocumentPeriodEndDate_019eadcc-a5d1-7b20-b9f0-d7bbac81fb34" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019eadcc-a5d1-7e58-94df-3fa27f2a72ab" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_DocumentTransitionReport_019eadcc-a5d1-7e58-94df-3fa27f2a72ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019eadcc-a5d1-7605-a66f-a54610b76a1f" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityFileNumber_019eadcc-a5d1-7605-a66f-a54610b76a1f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019eadcc-a5d1-770c-8a54-4d087c21c21f" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityRegistrantName_019eadcc-a5d1-770c-8a54-4d087c21c21f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019eadcc-a5d1-7f9c-863d-1a890334c47b" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019eadcc-a5d1-7f9c-863d-1a890334c47b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019eadcc-a5d1-78bb-95f0-5b0ac20cd439" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityTaxIdentificationNumber_019eadcc-a5d1-78bb-95f0-5b0ac20cd439" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019eadcc-a5d1-76d9-a3c6-5d84d17c890c" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityAddressAddressLine1_019eadcc-a5d1-76d9-a3c6-5d84d17c890c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019eadcc-a5d1-7023-b7ad-882129e28eb8" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityAddressCityOrTown_019eadcc-a5d1-7023-b7ad-882129e28eb8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019eadcc-a5d1-788b-aa91-7a0fc493fa4b" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityAddressStateOrProvince_019eadcc-a5d1-788b-aa91-7a0fc493fa4b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019eadcc-a5d1-7ee3-92b8-2db9b20e1dd5" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityAddressPostalZipCode_019eadcc-a5d1-7ee3-92b8-2db9b20e1dd5" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019eadcc-a5d1-70e5-b471-59f4622d6596" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_CityAreaCode_019eadcc-a5d1-70e5-b471-59f4622d6596" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019eadcc-a5d1-7b71-bf0e-b33f0f49766a" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_LocalPhoneNumber_019eadcc-a5d1-7b71-bf0e-b33f0f49766a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019eadcc-a5d1-7bfd-a658-be106e82010e" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_Security12bTitle_019eadcc-a5d1-7bfd-a658-be106e82010e" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019eadcc-a5d1-7531-b375-8f86b86430ac" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_TradingSymbol_019eadcc-a5d1-7531-b375-8f86b86430ac" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019eadcc-a5d1-7c1c-a37e-1a015b4dc1f7" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_SecurityExchangeName_019eadcc-a5d1-7c1c-a37e-1a015b4dc1f7" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019eadcc-a5d1-7fab-99a0-70cadf18642e" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityCurrentReportingStatus_019eadcc-a5d1-7fab-99a0-70cadf18642e" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019eadcc-a5d1-70cf-9bc5-af062d0b359a" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityInteractiveDataCurrent_019eadcc-a5d1-70cf-9bc5-af062d0b359a" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019eadcc-a5d1-7d77-b1b9-96452e5e6343" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityFilerCategory_019eadcc-a5d1-7d77-b1b9-96452e5e6343" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019eadcc-a5d1-7c2e-b757-1753a26c14e5" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntitySmallBusiness_019eadcc-a5d1-7c2e-b757-1753a26c14e5" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019eadcc-a5d1-7247-b528-34057898ea79" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityEmergingGrowthCompany_019eadcc-a5d1-7247-b528-34057898ea79" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019eadcc-a5d1-754f-a915-5218d7fc67d5" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityShellCompany_019eadcc-a5d1-754f-a915-5218d7fc67d5" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019eadcc-a5d1-7a04-a420-29e48d6643b7" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019eadcc-a5d1-7a04-a420-29e48d6643b7" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019eadcc-a5d1-76e2-a14e-5ae433d7cd7e" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019eadcc-a5d1-76e2-a14e-5ae433d7cd7e" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019eadcc-a5d1-7e51-b7ad-9391fdb409b0" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_AmendmentFlag_019eadcc-a5d1-7e51-b7ad-9391fdb409b0" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019eadcc-a5d1-79b3-baff-d235e6103a93" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_DocumentFiscalYearFocus_019eadcc-a5d1-79b3-baff-d235e6103a93" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019eadcc-a5d1-7dfe-9373-c18c2c811703" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_EntityCentralIndexKey_019eadcc-a5d1-7dfe-9373-c18c2c811703" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019eadcc-a5d1-7d8b-95c2-917e71586204" 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_019eadcc-a5d1-735f-a65f-3d2d43a3a29a" xlink:to="loc_dei_CurrentFiscalYearEndDate_019eadcc-a5d1-7d8b-95c2-917e71586204" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="uwmc-20260630.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cb6-a54b-cc1168a050e2" 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_019eadcc-a5d1-799e-a518-8301cfaa0502" 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_019eadcc-a5d1-7cb6-a54b-cc1168a050e2" xlink:to="loc_us-gaap_StatementTable_019eadcc-a5d1-799e-a518-8301cfaa0502" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a5d1-7106-895f-38afca121f72" 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_019eadcc-a5d1-799e-a518-8301cfaa0502" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a5d1-7106-895f-38afca121f72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7106-895f-38afca121f72_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_019eadcc-a5d1-7106-895f-38afca121f72" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7106-895f-38afca121f72_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7b07-b5eb-d589bf145688" 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_019eadcc-a5d1-7106-895f-38afca121f72" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7b07-b5eb-d589bf145688" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019eadcc-a5d1-7e8b-a649-bb406e65bb9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7b07-b5eb-d589bf145688" xlink:to="loc_us-gaap_CommonClassAMember_019eadcc-a5d1-7e8b-a649-bb406e65bb9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019eadcc-a5d1-78b3-977b-74f214bf674c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7b07-b5eb-d589bf145688" xlink:to="loc_us-gaap_CommonClassBMember_019eadcc-a5d1-78b3-977b-74f214bf674c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassCMember_019eadcc-a5d1-7463-b4f0-35204ffd9914" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7b07-b5eb-d589bf145688" xlink:to="loc_us-gaap_CommonClassCMember_019eadcc-a5d1-7463-b4f0-35204ffd9914" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_CommonClassDMember_019eadcc-a5d1-7284-8b0b-e17ca140fc60" xlink:href="uwmc-20260630.xsd#uwmc_CommonClassDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7b07-b5eb-d589bf145688" xlink:to="loc_uwmc_CommonClassDMember_019eadcc-a5d1-7284-8b0b-e17ca140fc60" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" 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_019eadcc-a5d1-7cb6-a54b-cc1168a050e2" xlink:to="loc_us-gaap_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019eadcc-a5d1-7bb1-8607-f23cb90ddcc9" 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_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019eadcc-a5d1-7bb1-8607-f23cb90ddcc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_019eadcc-a5d1-7791-9dc7-522c0f3bc881" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_019eadcc-a5d1-7791-9dc7-522c0f3bc881" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019eadcc-a5d1-7138-818e-6d7a07d9fd53" 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_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_DerivativeAssets_019eadcc-a5d1-7138-818e-6d7a07d9fd53" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedInterestFairValueDisclosure_019eadcc-a5d1-706d-af94-e74bf9446b51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedInterestFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_RetainedInterestFairValueDisclosure_019eadcc-a5d1-706d-af94-e74bf9446b51" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_019eadcc-a5d1-7353-a804-f90f2635eba3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_AccountsReceivableNet_019eadcc-a5d1-7353-a804-f90f2635eba3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAsset_019eadcc-a5d1-7fe5-9e4a-b97664e98b9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_ServicingAsset_019eadcc-a5d1-7fe5-9e4a-b97664e98b9b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019eadcc-a5d1-7245-929a-a53cb7ce3cfb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019eadcc-a5d1-7245-929a-a53cb7ce3cfb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019eadcc-a5d1-7dc6-916e-f0ced4ab3e24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019eadcc-a5d1-7dc6-916e-f0ced4ab3e24" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_019eadcc-a5d1-7841-b9ab-438c5d5770cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_019eadcc-a5d1-7841-b9ab-438c5d5770cc" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_019eadcc-a5d1-7f40-a44d-a43324e6511d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_019eadcc-a5d1-7f40-a44d-a43324e6511d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019eadcc-a5d1-71a9-a0e5-c439ce3e47e4" 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_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_OtherAssets_019eadcc-a5d1-71a9-a0e5-c439ce3e47e4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019eadcc-a5d1-7328-b070-827a3efc8135" 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_019eadcc-a5d1-775e-b621-335cba3e24ba" xlink:to="loc_us-gaap_Assets_019eadcc-a5d1-7328-b070-827a3efc8135" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" 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_019eadcc-a5d1-7cb6-a54b-cc1168a050e2" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_WarehouseLinesOfCreditFacility_019eadcc-a5d1-7aa1-bda8-c6ee013aaf69" xlink:href="uwmc-20260630.xsd#uwmc_WarehouseLinesOfCreditFacility"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_uwmc_WarehouseLinesOfCreditFacility_019eadcc-a5d1-7aa1-bda8-c6ee013aaf69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019eadcc-a5d1-760a-af4f-c39ef076e479" 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_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_DerivativeLiabilities_019eadcc-a5d1-760a-af4f-c39ef076e479" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019eadcc-a5d1-7d55-b163-738f4163b68f" 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_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_LineOfCredit_019eadcc-a5d1-7d55-b163-738f4163b68f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_019eadcc-a5d1-7685-938f-0a08d75d396f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_SecuredDebt_019eadcc-a5d1-7685-938f-0a08d75d396f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019eadcc-a5d1-7d31-89e7-701d49707525" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019eadcc-a5d1-7d31-89e7-701d49707525" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019eadcc-a5d1-7745-89fa-fa71cc5aa1fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019eadcc-a5d1-7745-89fa-fa71cc5aa1fe" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotes_019eadcc-a5d1-7a89-9144-6460a71951a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_SeniorNotes_019eadcc-a5d1-7a89-9144-6460a71951a4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019eadcc-a5d1-79d2-84c3-320916988914" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_OperatingLeaseLiability_019eadcc-a5d1-79d2-84c3-320916988914" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_019eadcc-a5d1-7ed0-8c95-cd119b9a3677" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_FinanceLeaseLiability_019eadcc-a5d1-7ed0-8c95-cd119b9a3677" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableFairValueDisclosure_019eadcc-a5d1-7063-8d2d-b852c6b15c7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansPayableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_LoansPayableFairValueDisclosure_019eadcc-a5d1-7063-8d2d-b852c6b15c7d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019eadcc-a5d1-7c60-a7e3-65d7e5a44f4b" 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_LiabilitiesAndStockholdersEquityAbstract_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_Liabilities_019eadcc-a5d1-7c60-a7e3-65d7e5a44f4b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019eadcc-a5d1-7e55-9890-ea51161bec7f" 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_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019eadcc-a5d1-7e55-9890-ea51161bec7f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_019eadcc-a5d1-7fbc-9c0a-29697e02a48b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019eadcc-a5d1-7e55-9890-ea51161bec7f" xlink:to="loc_us-gaap_PreferredStockValue_019eadcc-a5d1-7fbc-9c0a-29697e02a48b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019eadcc-a5d1-75a6-824a-26287284edc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019eadcc-a5d1-7e55-9890-ea51161bec7f" xlink:to="loc_us-gaap_CommonStockValue_019eadcc-a5d1-75a6-824a-26287284edc5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019eadcc-a5d1-79e8-a154-4c0d0dbed0dc" 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_019eadcc-a5d1-7e55-9890-ea51161bec7f" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019eadcc-a5d1-79e8-a154-4c0d0dbed0dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019eadcc-a5d1-79d5-ade0-63c1c0221291" 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_019eadcc-a5d1-7e55-9890-ea51161bec7f" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019eadcc-a5d1-79d5-ade0-63c1c0221291" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_019eadcc-a5d1-7fbd-84db-3ee6881e2f9e" 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_019eadcc-a5d1-7e55-9890-ea51161bec7f" xlink:to="loc_us-gaap_MinorityInterest_019eadcc-a5d1-7fbd-84db-3ee6881e2f9e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019eadcc-a5d1-7b4a-af6a-ca854509fd1d" 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_019eadcc-a5d1-7e55-9890-ea51161bec7f" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019eadcc-a5d1-7b4a-af6a-ca854509fd1d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019eadcc-a5d1-7169-a25d-9c746a04f6e6" 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_019eadcc-a5d1-7704-8524-e75a539a8b8b" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019eadcc-a5d1-7169-a25d-9c746a04f6e6" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="simple" xlink:href="uwmc-20260630.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" 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_019eadcc-a5d1-7fa7-a5ba-b2b01fefa78b" 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_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_StatementTable_019eadcc-a5d1-7fa7-a5ba-b2b01fefa78b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a5d1-7ca9-8e4e-9dc68e26b7a9" 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_019eadcc-a5d1-7fa7-a5ba-b2b01fefa78b" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a5d1-7ca9-8e4e-9dc68e26b7a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7ca9-8e4e-9dc68e26b7a9_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_019eadcc-a5d1-7ca9-8e4e-9dc68e26b7a9" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7ca9-8e4e-9dc68e26b7a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7078-8443-30cead0c56e6" 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_019eadcc-a5d1-7ca9-8e4e-9dc68e26b7a9" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7078-8443-30cead0c56e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019eadcc-a5d1-7e5d-a9b2-0a7c9f92750f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7078-8443-30cead0c56e6" xlink:to="loc_us-gaap_CommonClassAMember_019eadcc-a5d1-7e5d-a9b2-0a7c9f92750f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019eadcc-a5d1-7e88-afe4-ea27a0fd50dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7078-8443-30cead0c56e6" xlink:to="loc_us-gaap_CommonClassBMember_019eadcc-a5d1-7e88-afe4-ea27a0fd50dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassCMember_019eadcc-a5d1-7eae-bfaf-34387dd0f37c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7078-8443-30cead0c56e6" xlink:to="loc_us-gaap_CommonClassCMember_019eadcc-a5d1-7eae-bfaf-34387dd0f37c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_CommonClassDMember_019eadcc-a5d1-7a12-a808-e4f1258e9de8" xlink:href="uwmc-20260630.xsd#uwmc_CommonClassDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7078-8443-30cead0c56e6" xlink:to="loc_uwmc_CommonClassDMember_019eadcc-a5d1-7a12-a808-e4f1258e9de8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019eadcc-a5d1-752e-adfa-0bf1f7589334" 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_StatementTable_019eadcc-a5d1-7fa7-a5ba-b2b01fefa78b" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019eadcc-a5d1-752e-adfa-0bf1f7589334" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019eadcc-a5d1-752e-adfa-0bf1f7589334_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_019eadcc-a5d1-752e-adfa-0bf1f7589334" xlink:to="loc_us-gaap_RelatedPartyDomain_019eadcc-a5d1-752e-adfa-0bf1f7589334_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019eadcc-a5d1-7fda-9585-a4d9734777c1" 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_019eadcc-a5d1-752e-adfa-0bf1f7589334" xlink:to="loc_us-gaap_RelatedPartyDomain_019eadcc-a5d1-7fda-9585-a4d9734777c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019eadcc-a5d1-70be-93d6-4e08391297c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019eadcc-a5d1-7fda-9585-a4d9734777c1" xlink:to="loc_us-gaap_RelatedPartyMember_019eadcc-a5d1-70be-93d6-4e08391297c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashCurrent_019eadcc-a5d1-70c0-b84c-a9ac503edad0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_RestrictedCashCurrent_019eadcc-a5d1-70c0-b84c-a9ac503edad0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019eadcc-a5d1-7688-ad77-7b5a80c01449" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019eadcc-a5d1-7688-ad77-7b5a80c01449" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_019eadcc-a5d1-7b58-927c-193136680af1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_019eadcc-a5d1-7b58-927c-193136680af1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019eadcc-a5d1-73d4-b762-7e92a10e21b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_OperatingLeaseLiability_019eadcc-a5d1-73d4-b762-7e92a10e21b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_019eadcc-a5d1-7e05-9fb0-fa434feec994" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_FinanceLeaseLiability_019eadcc-a5d1-7e05-9fb0-fa434feec994" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019eadcc-a5d1-74f5-940a-6a7ab27a4e2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019eadcc-a5d1-74f5-940a-6a7ab27a4e2c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_019eadcc-a5d1-7887-b5d5-76bab853d53c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_019eadcc-a5d1-7887-b5d5-76bab853d53c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_019eadcc-a5d1-73c2-8a2e-2297ea042473" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_PreferredStockSharesIssued_019eadcc-a5d1-73c2-8a2e-2297ea042473" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_019eadcc-a5d1-7e55-9402-c10fbd4a28df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_019eadcc-a5d1-7e55-9402-c10fbd4a28df" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019eadcc-a5d1-7d05-bfef-f0b631d739fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019eadcc-a5d1-7d05-bfef-f0b631d739fe" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019eadcc-a5d1-7b82-9727-698d809009e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019eadcc-a5d1-7b82-9727-698d809009e7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_019eadcc-a5d1-7ee7-bd74-39a8d2fabbf3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_CommonStockSharesIssued_019eadcc-a5d1-7ee7-bd74-39a8d2fabbf3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019eadcc-a5d1-70ad-a964-7c972fdebdb6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7cbd-be8c-be8b16d1cd7f" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019eadcc-a5d1-70ad-a964-7c972fdebdb6" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY" xlink:type="simple" xlink:href="uwmc-20260630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019eadcc-a5d1-7af0-b2b1-475067d18500" 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_019eadcc-a5d1-7034-aab1-a9327ddf8b82" 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_019eadcc-a5d1-7af0-b2b1-475067d18500" xlink:to="loc_us-gaap_StatementTable_019eadcc-a5d1-7034-aab1-a9327ddf8b82" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019eadcc-a5d1-781f-bc16-6a0686cb6517" 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_019eadcc-a5d1-7034-aab1-a9327ddf8b82" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019eadcc-a5d1-781f-bc16-6a0686cb6517" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019eadcc-a5d1-781f-bc16-6a0686cb6517_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_019eadcc-a5d1-781f-bc16-6a0686cb6517" xlink:to="loc_us-gaap_EquityComponentDomain_019eadcc-a5d1-781f-bc16-6a0686cb6517_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019eadcc-a5d1-7177-a2f3-6381118d049e" 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_019eadcc-a5d1-781f-bc16-6a0686cb6517" xlink:to="loc_us-gaap_EquityComponentDomain_019eadcc-a5d1-7177-a2f3-6381118d049e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019eadcc-a5d1-7775-8bf7-b51a40d47d4e" 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_EquityComponentDomain_019eadcc-a5d1-7177-a2f3-6381118d049e" xlink:to="loc_us-gaap_CommonStockMember_019eadcc-a5d1-7775-8bf7-b51a40d47d4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019eadcc-a5d1-7fae-a497-e587fd2489fa" 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_EquityComponentDomain_019eadcc-a5d1-7177-a2f3-6381118d049e" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019eadcc-a5d1-7fae-a497-e587fd2489fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019eadcc-a5d1-7435-a446-8743cf115039" 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_EquityComponentDomain_019eadcc-a5d1-7177-a2f3-6381118d049e" xlink:to="loc_us-gaap_RetainedEarningsMember_019eadcc-a5d1-7435-a446-8743cf115039" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019eadcc-a5d1-7f90-b5c1-0acea15c752e" 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_019eadcc-a5d1-7177-a2f3-6381118d049e" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019eadcc-a5d1-7f90-b5c1-0acea15c752e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a5d1-7835-9a4f-274c1bbdcad2" 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_019eadcc-a5d1-7034-aab1-a9327ddf8b82" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a5d1-7835-9a4f-274c1bbdcad2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7835-9a4f-274c1bbdcad2_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_019eadcc-a5d1-7835-9a4f-274c1bbdcad2" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-7835-9a4f-274c1bbdcad2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-783c-ab1f-dd3daba1e9e0" 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_019eadcc-a5d1-7835-9a4f-274c1bbdcad2" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-783c-ab1f-dd3daba1e9e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019eadcc-a5d1-79e0-a329-25b15a81204f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-783c-ab1f-dd3daba1e9e0" xlink:to="loc_us-gaap_CommonClassAMember_019eadcc-a5d1-79e0-a329-25b15a81204f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_CommonClassDMember_019eadcc-a5d1-76ea-8ee5-576aa659c841" xlink:href="uwmc-20260630.xsd#uwmc_CommonClassDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-783c-ab1f-dd3daba1e9e0" xlink:to="loc_uwmc_CommonClassDMember_019eadcc-a5d1-76ea-8ee5-576aa659c841" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_019eadcc-a5d1-79f4-acc7-f10e54bd76f3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019eadcc-a5d1-7034-aab1-a9327ddf8b82" xlink:to="loc_srt_RestatementAxis_019eadcc-a5d1-79f4-acc7-f10e54bd76f3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019eadcc-a5d1-79f4-acc7-f10e54bd76f3_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_019eadcc-a5d1-79f4-acc7-f10e54bd76f3" xlink:to="loc_srt_RestatementDomain_019eadcc-a5d1-79f4-acc7-f10e54bd76f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019eadcc-a5d1-7e3d-ba35-6634ac5a4fc3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_019eadcc-a5d1-79f4-acc7-f10e54bd76f3" xlink:to="loc_srt_RestatementDomain_019eadcc-a5d1-7e3d-ba35-6634ac5a4fc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RevisionOfPriorPeriodReclassificationAdjustmentMember_019eadcc-a5d1-7a88-a92e-a071eb5bcdc3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RevisionOfPriorPeriodReclassificationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_019eadcc-a5d1-7e3d-ba35-6634ac5a4fc3" xlink:to="loc_srt_RevisionOfPriorPeriodReclassificationAdjustmentMember_019eadcc-a5d1-7a88-a92e-a071eb5bcdc3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" 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_019eadcc-a5d1-7af0-b2b1-475067d18500" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019eadcc-a5d1-7cd9-9403-3a5c5878c4b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019eadcc-a5d1-7cd9-9403-3a5c5878c4b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019eadcc-a5d1-7ff2-b099-7245513af2da" 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_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019eadcc-a5d1-7ff2-b099-7245513af2da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019eadcc-a5d1-72d1-9a97-d64fcae1a737" 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_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" xlink:to="loc_us-gaap_ProfitLoss_019eadcc-a5d1-72d1-9a97-d64fcae1a737" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_019eadcc-a5d1-7a4b-8b27-158ae0dc44ac" 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_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" xlink:to="loc_us-gaap_DividendsCommonStock_019eadcc-a5d1-7a4b-8b27-158ae0dc44ac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019eadcc-a5d1-76f8-9a85-13c07a2d0e57" 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_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019eadcc-a5d1-76f8-9a85-13c07a2d0e57" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019eadcc-a5d1-7ca3-8878-eea388fafa8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019eadcc-a5d1-7ca3-8878-eea388fafa8a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019eadcc-a5d1-790c-a8cc-e7b3b1c2ce79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019eadcc-a5d1-790c-a8cc-e7b3b1c2ce79" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterestSharesIssuedDuringPeriod_019eadcc-a5d1-7ab3-9208-6343226caf4d" xlink:href="uwmc-20260630.xsd#uwmc_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterestSharesIssuedDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" xlink:to="loc_uwmc_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterestSharesIssuedDuringPeriod_019eadcc-a5d1-7ab3-9208-6343226caf4d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_NoncontrollingInterestRemeasurementDueToChangeInParentOwnership_019eadcc-a5d1-71f1-9843-eb36bcd4c1ad" xlink:href="uwmc-20260630.xsd#uwmc_NoncontrollingInterestRemeasurementDueToChangeInParentOwnership"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019eadcc-a5d1-71c4-8597-3bcb5b1cae77" xlink:to="loc_uwmc_NoncontrollingInterestRemeasurementDueToChangeInParentOwnership_019eadcc-a5d1-71f1-9843-eb36bcd4c1ad" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019eadcc-a5d1-79d2-979c-525fdcded49b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019eadcc-a5d1-7f50-b963-23c1435deb93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/OrganizationBasisofPresentationandSummaryofSignificantAccountingPoliciesOrganizationDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#OrganizationBasisofPresentationandSummaryofSignificantAccountingPoliciesOrganizationDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/OrganizationBasisofPresentationandSummaryofSignificantAccountingPoliciesOrganizationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_019eadcc-a5d1-77a6-b4f0-2c16ccbbd6fe" xlink:href="uwmc-20260630.xsd#uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_019eadcc-a5d1-7693-a3fe-271949401d90" xlink:href="uwmc-20260630.xsd#uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_019eadcc-a5d1-77a6-b4f0-2c16ccbbd6fe" xlink:to="loc_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_019eadcc-a5d1-7693-a3fe-271949401d90" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019eadcc-a5d1-74d2-9ce4-46e7ac9c764b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_019eadcc-a5d1-7693-a3fe-271949401d90" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019eadcc-a5d1-74d2-9ce4-46e7ac9c764b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019eadcc-a5d1-74d2-9ce4-46e7ac9c764b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019eadcc-a5d1-74d2-9ce4-46e7ac9c764b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019eadcc-a5d1-74d2-9ce4-46e7ac9c764b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019eadcc-a5d1-784c-a5eb-eaadeccc1e11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019eadcc-a5d1-74d2-9ce4-46e7ac9c764b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019eadcc-a5d1-784c-a5eb-eaadeccc1e11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_UwmHoldingsCorporationMember_019eadcc-a5d1-7132-8dd7-e7436d378bec" xlink:href="uwmc-20260630.xsd#uwmc_UwmHoldingsCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019eadcc-a5d1-784c-a5eb-eaadeccc1e11" xlink:to="loc_uwmc_UwmHoldingsCorporationMember_019eadcc-a5d1-7132-8dd7-e7436d378bec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a5d1-71b8-ab50-27e73133ce30" 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_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_019eadcc-a5d1-7693-a3fe-271949401d90" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a5d1-71b8-ab50-27e73133ce30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-71b8-ab50-27e73133ce30_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_019eadcc-a5d1-71b8-ab50-27e73133ce30" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-71b8-ab50-27e73133ce30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-736b-b73a-b9b19bff0416" 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_019eadcc-a5d1-71b8-ab50-27e73133ce30" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-736b-b73a-b9b19bff0416" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019eadcc-a5d1-7349-8638-28a54d200ee0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-736b-b73a-b9b19bff0416" xlink:to="loc_us-gaap_CommonClassAMember_019eadcc-a5d1-7349-8638-28a54d200ee0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019eadcc-a5d1-74fa-8adc-5fdc8a38ab60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-736b-b73a-b9b19bff0416" xlink:to="loc_us-gaap_CommonClassBMember_019eadcc-a5d1-74fa-8adc-5fdc8a38ab60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassCMember_019eadcc-a5d1-7306-b79e-4d0bd06bd6df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-736b-b73a-b9b19bff0416" xlink:to="loc_us-gaap_CommonClassCMember_019eadcc-a5d1-7306-b79e-4d0bd06bd6df" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_CommonClassDMember_019eadcc-a5d1-79a2-a5d9-dc0a1b3965ab" xlink:href="uwmc-20260630.xsd#uwmc_CommonClassDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a5d1-736b-b73a-b9b19bff0416" xlink:to="loc_uwmc_CommonClassDMember_019eadcc-a5d1-79a2-a5d9-dc0a1b3965ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019eadcc-a5d1-7cae-b6f4-444b7657f31c" 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_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_019eadcc-a5d1-7693-a3fe-271949401d90" xlink:to="loc_srt_RangeAxis_019eadcc-a5d1-7cae-b6f4-444b7657f31c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a5d1-7cae-b6f4-444b7657f31c_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_019eadcc-a5d1-7cae-b6f4-444b7657f31c" xlink:to="loc_srt_RangeMember_019eadcc-a5d1-7cae-b6f4-444b7657f31c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a5d1-73d4-8eb8-d852e1322067" 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_019eadcc-a5d1-7cae-b6f4-444b7657f31c" xlink:to="loc_srt_RangeMember_019eadcc-a5d1-73d4-8eb8-d852e1322067" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019eadcc-a5d1-7b40-b631-4f33aedfc4c2" 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_019eadcc-a5d1-73d4-8eb8-d852e1322067" xlink:to="loc_srt_MinimumMember_019eadcc-a5d1-7b40-b631-4f33aedfc4c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019eadcc-a5d1-74cc-8aac-e0a2aadacfac" 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_019eadcc-a5d1-73d4-8eb8-d852e1322067" xlink:to="loc_srt_MaximumMember_019eadcc-a5d1-74cc-8aac-e0a2aadacfac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_019eadcc-a5d1-76d6-9b7c-1d28cc8137f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_019eadcc-a5d1-77a6-b4f0-2c16ccbbd6fe" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_019eadcc-a5d1-76d6-9b7c-1d28cc8137f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_NumberOfClassesOfEquity_019eadcc-a5d1-79fa-a273-6c9c34100dee" xlink:href="uwmc-20260630.xsd#uwmc_NumberOfClassesOfEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_019eadcc-a5d1-77a6-b4f0-2c16ccbbd6fe" xlink:to="loc_uwmc_NumberOfClassesOfEquity_019eadcc-a5d1-79fa-a273-6c9c34100dee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_NumberOfClassesOfStock_019eadcc-a5d1-782f-a5cc-15ba2ccd9960" xlink:href="uwmc-20260630.xsd#uwmc_NumberOfClassesOfStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_019eadcc-a5d1-77a6-b4f0-2c16ccbbd6fe" xlink:to="loc_uwmc_NumberOfClassesOfStock_019eadcc-a5d1-782f-a5cc-15ba2ccd9960" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_CommonStockVotingRightsNumber_019eadcc-a5d1-7e45-91c0-702865720851" xlink:href="uwmc-20260630.xsd#uwmc_CommonStockVotingRightsNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems_019eadcc-a5d1-77a6-b4f0-2c16ccbbd6fe" xlink:to="loc_uwmc_CommonStockVotingRightsNumber_019eadcc-a5d1-7e45-91c0-702865720851" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/OrganizationBasisofPresentationandSummaryofSignificantAccountingPoliciesStockBasedCompensationDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#OrganizationBasisofPresentationandSummaryofSignificantAccountingPoliciesStockBasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/OrganizationBasisofPresentationandSummaryofSignificantAccountingPoliciesStockBasedCompensationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a5d1-72f3-86d2-461736eeba2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019eadcc-a5d1-7fc1-9a8b-38884c22e247" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a5d1-72f3-86d2-461736eeba2a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019eadcc-a5d1-7fc1-9a8b-38884c22e247" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019eadcc-a5d1-7a76-91ad-2a67de48afe3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019eadcc-a5d1-7fc1-9a8b-38884c22e247" xlink:to="loc_us-gaap_PlanNameAxis_019eadcc-a5d1-7a76-91ad-2a67de48afe3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019eadcc-a5d1-7a76-91ad-2a67de48afe3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_019eadcc-a5d1-7a76-91ad-2a67de48afe3" xlink:to="loc_us-gaap_PlanNameDomain_019eadcc-a5d1-7a76-91ad-2a67de48afe3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019eadcc-a5d1-7595-b73f-a103dad6c9e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_019eadcc-a5d1-7a76-91ad-2a67de48afe3" xlink:to="loc_us-gaap_PlanNameDomain_019eadcc-a5d1-7595-b73f-a103dad6c9e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_A2020UWMHoldingsCorporationOmnibusIncentivePlanMember_019eadcc-a5d1-721f-9292-a938299f2d77" xlink:href="uwmc-20260630.xsd#uwmc_A2020UWMHoldingsCorporationOmnibusIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019eadcc-a5d1-7595-b73f-a103dad6c9e9" xlink:to="loc_uwmc_A2020UWMHoldingsCorporationOmnibusIncentivePlanMember_019eadcc-a5d1-721f-9292-a938299f2d77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019eadcc-a5d1-7595-bd82-b251494371b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a5d1-72f3-86d2-461736eeba2a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019eadcc-a5d1-7595-bd82-b251494371b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019eadcc-a5d1-7d90-8853-b73d30ca7aec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a5d1-72f3-86d2-461736eeba2a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019eadcc-a5d1-7d90-8853-b73d30ca7aec" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/DerivativesScheduleofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#DerivativesScheduleofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/DerivativesScheduleofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019eadcc-a5d1-72b7-935c-e3c7c6c32888" 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_019eadcc-a5d1-7ad7-97e0-1e8a66a8a37c" 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_019eadcc-a5d1-72b7-935c-e3c7c6c32888" xlink:to="loc_us-gaap_DerivativeTable_019eadcc-a5d1-7ad7-97e0-1e8a66a8a37c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019eadcc-a5d1-7ce9-9fc7-200fc4360c62" 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_019eadcc-a5d1-7ad7-97e0-1e8a66a8a37c" xlink:to="loc_us-gaap_HedgingDesignationAxis_019eadcc-a5d1-7ce9-9fc7-200fc4360c62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019eadcc-a5d1-7ce9-9fc7-200fc4360c62_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_019eadcc-a5d1-7ce9-9fc7-200fc4360c62" xlink:to="loc_us-gaap_HedgingDesignationDomain_019eadcc-a5d1-7ce9-9fc7-200fc4360c62_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019eadcc-a5d1-7235-a4b9-e5ba7a2de020" 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_019eadcc-a5d1-7ce9-9fc7-200fc4360c62" xlink:to="loc_us-gaap_HedgingDesignationDomain_019eadcc-a5d1-7235-a4b9-e5ba7a2de020" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019eadcc-a5d1-73bc-9cdd-5d45c86278aa" 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_019eadcc-a5d1-7235-a4b9-e5ba7a2de020" xlink:to="loc_us-gaap_NondesignatedMember_019eadcc-a5d1-73bc-9cdd-5d45c86278aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a5d1-732c-8f1e-c2ccc3819e77" 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_019eadcc-a5d1-7ad7-97e0-1e8a66a8a37c" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a5d1-732c-8f1e-c2ccc3819e77" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-732c-8f1e-c2ccc3819e77_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_019eadcc-a5d1-732c-8f1e-c2ccc3819e77" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-732c-8f1e-c2ccc3819e77_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-7959-bfac-76555ee754a8" 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_019eadcc-a5d1-732c-8f1e-c2ccc3819e77" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-7959-bfac-76555ee754a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateLockCommitmentsMember_019eadcc-a5d1-7cf5-92f0-749e847f61aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateLockCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-7959-bfac-76555ee754a8" xlink:to="loc_us-gaap_InterestRateLockCommitmentsMember_019eadcc-a5d1-7cf5-92f0-749e847f61aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ForwardLoanSaleCommitmentsMember_019eadcc-a5d1-7ea0-9742-5c99d16b7f1a" xlink:href="uwmc-20260630.xsd#uwmc_ForwardLoanSaleCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-7959-bfac-76555ee754a8" xlink:to="loc_uwmc_ForwardLoanSaleCommitmentsMember_019eadcc-a5d1-7ea0-9742-5c99d16b7f1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019eadcc-a5d1-7fee-b57c-0390777e1627" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-7959-bfac-76555ee754a8" xlink:to="loc_us-gaap_InterestRateContractMember_019eadcc-a5d1-7fee-b57c-0390777e1627" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019eadcc-a5d1-71d2-b7dd-5b004f5e61c5" 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_019eadcc-a5d1-72b7-935c-e3c7c6c32888" xlink:to="loc_us-gaap_DerivativeAssets_019eadcc-a5d1-71d2-b7dd-5b004f5e61c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019eadcc-a5d1-748d-a0ce-b611f671900f" 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_019eadcc-a5d1-72b7-935c-e3c7c6c32888" xlink:to="loc_us-gaap_DerivativeLiabilities_019eadcc-a5d1-748d-a0ce-b611f671900f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019eadcc-a5d1-7a5b-8fdf-6e64804e58c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019eadcc-a5d1-72b7-935c-e3c7c6c32888" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019eadcc-a5d1-7a5b-8fdf-6e64804e58c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_InterestRateLockCommitmentPullThroughRate_019eadcc-a5d1-79f8-b8f2-8ee4c67d642a" xlink:href="uwmc-20260630.xsd#uwmc_InterestRateLockCommitmentPullThroughRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019eadcc-a5d1-72b7-935c-e3c7c6c32888" xlink:to="loc_uwmc_InterestRateLockCommitmentPullThroughRate_019eadcc-a5d1-79f8-b8f2-8ee4c67d642a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/MortgageServicingRightsAdditionalInformationDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#MortgageServicingRightsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/MortgageServicingRightsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MortgageServicingRightsLineItems_019eadcc-a5d1-7deb-b8ed-e8887c02fc86" xlink:href="uwmc-20260630.xsd#uwmc_MortgageServicingRightsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MortgageServicingRightsTable_019eadcc-a5d1-7a46-a959-0a2a2497d041" xlink:href="uwmc-20260630.xsd#uwmc_MortgageServicingRightsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_uwmc_MortgageServicingRightsLineItems_019eadcc-a5d1-7deb-b8ed-e8887c02fc86" xlink:to="loc_uwmc_MortgageServicingRightsTable_019eadcc-a5d1-7a46-a959-0a2a2497d041" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a5d1-70c3-b1c9-6b580f80f90e" 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_uwmc_MortgageServicingRightsTable_019eadcc-a5d1-7a46-a959-0a2a2497d041" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a5d1-70c3-b1c9-6b580f80f90e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-70c3-b1c9-6b580f80f90e_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_019eadcc-a5d1-70c3-b1c9-6b580f80f90e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-70c3-b1c9-6b580f80f90e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-74c1-9b26-ed65f5fcba05" 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_019eadcc-a5d1-70c3-b1c9-6b580f80f90e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-74c1-9b26-ed65f5fcba05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MortgageServicingRightsMember_019eadcc-a5d1-7d75-ab5c-57221010eef8" xlink:href="uwmc-20260630.xsd#uwmc_MortgageServicingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-74c1-9b26-ed65f5fcba05" xlink:to="loc_uwmc_MortgageServicingRightsMember_019eadcc-a5d1-7d75-ab5c-57221010eef8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ExcessServicingCashFlowsMember_019eadcc-a5d1-7eb8-b420-daf9213c5418" xlink:href="uwmc-20260630.xsd#uwmc_ExcessServicingCashFlowsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-74c1-9b26-ed65f5fcba05" xlink:to="loc_uwmc_ExcessServicingCashFlowsMember_019eadcc-a5d1-7eb8-b420-daf9213c5418" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAsset_019eadcc-a5d1-7ac5-89a3-029752c9ad4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_MortgageServicingRightsLineItems_019eadcc-a5d1-7deb-b8ed-e8887c02fc86" xlink:to="loc_us-gaap_ServicingAsset_019eadcc-a5d1-7ac5-89a3-029752c9ad4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ServicingAssetSold_019eadcc-a5d1-7ebb-ae12-51449abe18fc" xlink:href="uwmc-20260630.xsd#uwmc_ServicingAssetSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_MortgageServicingRightsLineItems_019eadcc-a5d1-7deb-b8ed-e8887c02fc86" xlink:to="loc_uwmc_ServicingAssetSold_019eadcc-a5d1-7ebb-ae12-51449abe18fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR_019eadcc-a5d1-78f5-bafa-2fa0347847f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_MortgageServicingRightsLineItems_019eadcc-a5d1-7deb-b8ed-e8887c02fc86" xlink:to="loc_us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR_019eadcc-a5d1-78f5-bafa-2fa0347847f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ServicingAssetAtFairValueReservesAndTransactionCostsOnDisposal_019eadcc-a5d1-708c-94a8-fc3971164ba7" xlink:href="uwmc-20260630.xsd#uwmc_ServicingAssetAtFairValueReservesAndTransactionCostsOnDisposal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_MortgageServicingRightsLineItems_019eadcc-a5d1-7deb-b8ed-e8887c02fc86" xlink:to="loc_uwmc_ServicingAssetAtFairValueReservesAndTransactionCostsOnDisposal_019eadcc-a5d1-708c-94a8-fc3971164ba7" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/MortgageServicingRightsSummaryofMortgageServicingRightsActivityDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#MortgageServicingRightsSummaryofMortgageServicingRightsActivityDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/MortgageServicingRightsSummaryofMortgageServicingRightsActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MortgageServicingRightsLineItems_019eadcc-a5d1-7376-bf40-a70dd6ebbff3" xlink:href="uwmc-20260630.xsd#uwmc_MortgageServicingRightsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MortgageServicingRightsTable_019eadcc-a5d1-72ac-a010-90f41c9d4a6d" xlink:href="uwmc-20260630.xsd#uwmc_MortgageServicingRightsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_uwmc_MortgageServicingRightsLineItems_019eadcc-a5d1-7376-bf40-a70dd6ebbff3" xlink:to="loc_uwmc_MortgageServicingRightsTable_019eadcc-a5d1-72ac-a010-90f41c9d4a6d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a5d1-72d1-8798-925ce9c6b25e" 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_uwmc_MortgageServicingRightsTable_019eadcc-a5d1-72ac-a010-90f41c9d4a6d" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a5d1-72d1-8798-925ce9c6b25e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-72d1-8798-925ce9c6b25e_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_019eadcc-a5d1-72d1-8798-925ce9c6b25e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-72d1-8798-925ce9c6b25e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-72bb-bdf9-f49e9d71f826" 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_019eadcc-a5d1-72d1-8798-925ce9c6b25e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-72bb-bdf9-f49e9d71f826" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MortgageServicingRightsMember_019eadcc-a5d1-71a2-98fa-287c3452f105" xlink:href="uwmc-20260630.xsd#uwmc_MortgageServicingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-72bb-bdf9-f49e9d71f826" xlink:to="loc_uwmc_MortgageServicingRightsMember_019eadcc-a5d1-71a2-98fa-287c3452f105" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_019eadcc-a5d1-7634-a053-98c67093cad5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAmountRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_MortgageServicingRightsLineItems_019eadcc-a5d1-7376-bf40-a70dd6ebbff3" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_019eadcc-a5d1-7634-a053-98c67093cad5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_019eadcc-a5d1-752b-bbba-b1c28274d68f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_019eadcc-a5d1-7634-a053-98c67093cad5" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_019eadcc-a5d1-752b-bbba-b1c28274d68f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAdditions_019eadcc-a5d1-7ffd-87c4-4eea9f015eb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_019eadcc-a5d1-7634-a053-98c67093cad5" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAdditions_019eadcc-a5d1-7ffd-87c4-4eea9f015eb7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueDisposals_019eadcc-a5d1-7692-90eb-fc518815bc51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueDisposals"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_019eadcc-a5d1-7634-a053-98c67093cad5" xlink:to="loc_us-gaap_ServicingAssetAtFairValueDisposals_019eadcc-a5d1-7692-90eb-fc518815bc51" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions_019eadcc-a5d1-75d1-9f2f-526ca06626ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_019eadcc-a5d1-7634-a053-98c67093cad5" xlink:to="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions_019eadcc-a5d1-75d1-9f2f-526ca06626ba" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ServicingAssetAtFairValueSettlements_019eadcc-a5d1-710a-8b50-955a111cbd66" xlink:href="uwmc-20260630.xsd#uwmc_ServicingAssetAtFairValueSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_019eadcc-a5d1-7634-a053-98c67093cad5" xlink:to="loc_uwmc_ServicingAssetAtFairValueSettlements_019eadcc-a5d1-710a-8b50-955a111cbd66" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_019eadcc-a5d1-71a9-89a8-9640f2075894" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ServicingAssetAtFairValueChangeInFairValueAbstract_019eadcc-a5d1-7334-aa27-d5636decd480" xlink:href="uwmc-20260630.xsd#uwmc_ServicingAssetAtFairValueChangeInFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_019eadcc-a5d1-7634-a053-98c67093cad5" xlink:to="loc_uwmc_ServicingAssetAtFairValueChangeInFairValueAbstract_019eadcc-a5d1-7334-aa27-d5636decd480" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptionsNet_019eadcc-a5d1-7cfb-be66-f2f5205604b8" xlink:href="uwmc-20260630.xsd#uwmc_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptionsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_ServicingAssetAtFairValueChangeInFairValueAbstract_019eadcc-a5d1-7334-aa27-d5636decd480" xlink:to="loc_uwmc_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptionsNet_019eadcc-a5d1-7cfb-be66-f2f5205604b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ServicingAssetAtFairValueSettlements_019eadcc-a5d1-79b1-882f-a8f6409f42a0" xlink:href="uwmc-20260630.xsd#uwmc_ServicingAssetAtFairValueSettlements"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ServicingAssetAtFairValueReservesAndTransactionCostsOnDisposal_019eadcc-a5d1-7d70-9788-a50dea9b0148" xlink:href="uwmc-20260630.xsd#uwmc_ServicingAssetAtFairValueReservesAndTransactionCostsOnDisposal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_ServicingAssetAtFairValueChangeInFairValueAbstract_019eadcc-a5d1-7334-aa27-d5636decd480" xlink:to="loc_uwmc_ServicingAssetAtFairValueReservesAndTransactionCostsOnDisposal_019eadcc-a5d1-7d70-9788-a50dea9b0148" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ServicingAssetAtFairValueChangesInFairValue_019eadcc-a5d1-7623-85fa-033a509aa043" xlink:href="uwmc-20260630.xsd#uwmc_ServicingAssetAtFairValueChangesInFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_uwmc_ServicingAssetAtFairValueChangeInFairValueAbstract_019eadcc-a5d1-7334-aa27-d5636decd480" xlink:to="loc_uwmc_ServicingAssetAtFairValueChangesInFairValue_019eadcc-a5d1-7623-85fa-033a509aa043" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/MortgageServicingRightsSummaryofKeyUnobservableInputsUsedinDeterminingtheFairValueDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#MortgageServicingRightsSummaryofKeyUnobservableInputsUsedinDeterminingtheFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/MortgageServicingRightsSummaryofKeyUnobservableInputsUsedinDeterminingtheFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAtFairValueLineItems_019eadcc-a5d1-7a4e-abb9-a29885705a80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAtFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAtFairValueTable_019eadcc-a5d1-7ef5-9614-7456521f388c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAtFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_019eadcc-a5d1-7a4e-abb9-a29885705a80" xlink:to="loc_us-gaap_ServicingAssetsAtFairValueTable_019eadcc-a5d1-7ef5-9614-7456521f388c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a5d1-7647-9058-204748c3fc44" 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_ServicingAssetsAtFairValueTable_019eadcc-a5d1-7ef5-9614-7456521f388c" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a5d1-7647-9058-204748c3fc44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-7647-9058-204748c3fc44_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_019eadcc-a5d1-7647-9058-204748c3fc44" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-7647-9058-204748c3fc44_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-77d7-9031-617c6959415b" 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_019eadcc-a5d1-7647-9058-204748c3fc44" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-77d7-9031-617c6959415b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MortgageServicingRightsMember_019eadcc-a5d1-76ce-9e7c-e554be4c68b0" xlink:href="uwmc-20260630.xsd#uwmc_MortgageServicingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-77d7-9031-617c6959415b" xlink:to="loc_uwmc_MortgageServicingRightsMember_019eadcc-a5d1-76ce-9e7c-e554be4c68b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019eadcc-a5d1-7191-9572-6392841677f0" 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_ServicingAssetsAtFairValueTable_019eadcc-a5d1-7ef5-9614-7456521f388c" xlink:to="loc_srt_RangeAxis_019eadcc-a5d1-7191-9572-6392841677f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a5d1-7191-9572-6392841677f0_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_019eadcc-a5d1-7191-9572-6392841677f0" xlink:to="loc_srt_RangeMember_019eadcc-a5d1-7191-9572-6392841677f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a5d1-7523-9a15-04c5c09d6930" 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_019eadcc-a5d1-7191-9572-6392841677f0" xlink:to="loc_srt_RangeMember_019eadcc-a5d1-7523-9a15-04c5c09d6930" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019eadcc-a5d1-78ed-b270-8becff359ab8" 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_019eadcc-a5d1-7523-9a15-04c5c09d6930" xlink:to="loc_srt_MinimumMember_019eadcc-a5d1-78ed-b270-8becff359ab8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019eadcc-a5d1-70c9-af97-7d98286e0618" 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_019eadcc-a5d1-7523-9a15-04c5c09d6930" xlink:to="loc_srt_MaximumMember_019eadcc-a5d1-70c9-af97-7d98286e0618" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019eadcc-a5d1-7ca3-8874-e2c70d8a9a2f" 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_019eadcc-a5d1-7523-9a15-04c5c09d6930" xlink:to="loc_srt_WeightedAverageMember_019eadcc-a5d1-7ca3-8874-e2c70d8a9a2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_019eadcc-a5d1-71c1-82a1-777953287328" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_019eadcc-a5d1-7a4e-abb9-a29885705a80" xlink:to="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_019eadcc-a5d1-71c1-82a1-777953287328" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed_019eadcc-a5d1-78b6-a864-3f324d97a281" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_019eadcc-a5d1-7a4e-abb9-a29885705a80" xlink:to="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed_019eadcc-a5d1-78b6-a864-3f324d97a281" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueCostOfServicing_019eadcc-a5d1-7a95-a50c-332fd3705955" xlink:href="uwmc-20260630.xsd#uwmc_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueCostOfServicing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_019eadcc-a5d1-7a4e-abb9-a29885705a80" xlink:to="loc_uwmc_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueCostOfServicing_019eadcc-a5d1-7a95-a50c-332fd3705955" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/MortgageServicingRightsScheduleofAnalysisofChangeinFairValueDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#MortgageServicingRightsScheduleofAnalysisofChangeinFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/MortgageServicingRightsScheduleofAnalysisofChangeinFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems_019eadcc-a5d1-7204-aac7-bf3cfaddbf8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesTable_019eadcc-a5d1-7cde-b377-9b882fccc1b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems_019eadcc-a5d1-7204-aac7-bf3cfaddbf8c" xlink:to="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesTable_019eadcc-a5d1-7cde-b377-9b882fccc1b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a5d1-79fd-becd-b5fe17dbaac3" 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_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesTable_019eadcc-a5d1-7cde-b377-9b882fccc1b5" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a5d1-79fd-becd-b5fe17dbaac3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-79fd-becd-b5fe17dbaac3_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_019eadcc-a5d1-79fd-becd-b5fe17dbaac3" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-79fd-becd-b5fe17dbaac3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-74f5-8b38-4d77e707ea76" 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_019eadcc-a5d1-79fd-becd-b5fe17dbaac3" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-74f5-8b38-4d77e707ea76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MortgageServicingRightsMember_019eadcc-a5d1-737d-8961-1e6e5adc652e" xlink:href="uwmc-20260630.xsd#uwmc_MortgageServicingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a5d1-74f5-8b38-4d77e707ea76" xlink:to="loc_uwmc_MortgageServicingRightsMember_019eadcc-a5d1-737d-8961-1e6e5adc652e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate_019eadcc-a5d1-7720-b79f-2e77ec35553e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems_019eadcc-a5d1-7204-aac7-bf3cfaddbf8c" xlink:to="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate_019eadcc-a5d1-7720-b79f-2e77ec35553e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate_019eadcc-a5d1-76c0-871a-02967cdb847b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems_019eadcc-a5d1-7204-aac7-bf3cfaddbf8c" xlink:to="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate_019eadcc-a5d1-76c0-871a-02967cdb847b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed_019eadcc-a5d1-7f84-84da-2c719d2da905" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems_019eadcc-a5d1-7204-aac7-bf3cfaddbf8c" xlink:to="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed_019eadcc-a5d1-7f84-84da-2c719d2da905" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed_019eadcc-a5d1-7d0f-84e9-7d5a6c70f2d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems_019eadcc-a5d1-7204-aac7-bf3cfaddbf8c" xlink:to="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed_019eadcc-a5d1-7d0f-84e9-7d5a6c70f2d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInCostServicing_019eadcc-a5d1-7015-8b01-6a2dfaf1c185" xlink:href="uwmc-20260630.xsd#uwmc_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInCostServicing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems_019eadcc-a5d1-7204-aac7-bf3cfaddbf8c" xlink:to="loc_uwmc_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInCostServicing_019eadcc-a5d1-7015-8b01-6a2dfaf1c185" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInCostServicing_019eadcc-a5d1-7593-b32c-3789bc2fed15" xlink:href="uwmc-20260630.xsd#uwmc_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInCostServicing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems_019eadcc-a5d1-7204-aac7-bf3cfaddbf8c" xlink:to="loc_uwmc_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInCostServicing_019eadcc-a5d1-7593-b32c-3789bc2fed15" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/WarehouseandOtherSecuredLinesofCreditSummaryofLineofCreditDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#WarehouseandOtherSecuredLinesofCreditSummaryofLineofCreditDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/WarehouseandOtherSecuredLinesofCreditSummaryofLineofCreditDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019eadcc-a5d2-7477-83c1-92bd861fc8b8" 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_019eadcc-a5d2-7228-90bc-ce943c5062d5" 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_019eadcc-a5d2-7477-83c1-92bd861fc8b8" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019eadcc-a5d2-7228-90bc-ce943c5062d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019eadcc-a5d2-7633-97fa-54f4967e13c2" 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_LineOfCreditFacilityTable_019eadcc-a5d2-7228-90bc-ce943c5062d5" xlink:to="loc_us-gaap_CreditFacilityAxis_019eadcc-a5d2-7633-97fa-54f4967e13c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-7633-97fa-54f4967e13c2_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_019eadcc-a5d2-7633-97fa-54f4967e13c2" xlink:to="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-7633-97fa-54f4967e13c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-7836-a336-61799d2e48a2" 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_019eadcc-a5d2-7633-97fa-54f4967e13c2" xlink:to="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-7836-a336-61799d2e48a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_WarehouseLineOfCreditMember_019eadcc-a5d2-7f42-827f-16eb5acb8828" xlink:href="uwmc-20260630.xsd#uwmc_WarehouseLineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-7836-a336-61799d2e48a2" xlink:to="loc_uwmc_WarehouseLineOfCreditMember_019eadcc-a5d2-7f42-827f-16eb5acb8828" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019eadcc-a5d2-73d9-9c68-f1eeca8993d9" 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_019eadcc-a5d2-7228-90bc-ce943c5062d5" xlink:to="loc_us-gaap_DebtInstrumentAxis_019eadcc-a5d2-73d9-9c68-f1eeca8993d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-73d9-9c68-f1eeca8993d9_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_019eadcc-a5d2-73d9-9c68-f1eeca8993d9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-73d9-9c68-f1eeca8993d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" 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_019eadcc-a5d2-73d9-9c68-f1eeca8993d9" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueSeptember292026Member_019eadcc-a5d2-7271-a0bc-a82c9ac6602d" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueSeptember292026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueSeptember292026Member_019eadcc-a5d2-7271-a0bc-a82c9ac6602d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueOctober82026Member_019eadcc-a5d2-7bec-bc49-7b6cd450039f" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueOctober82026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueOctober82026Member_019eadcc-a5d2-7bec-bc49-7b6cd450039f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueDecember172026Member_019eadcc-a5d2-7b2e-9c85-8552a14b5d31" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueDecember172026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueDecember172026Member_019eadcc-a5d2-7b2e-9c85-8552a14b5d31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueFebruary52027Member_019eadcc-a5d2-7a23-963b-7bd09a7beb7a" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueFebruary52027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueFebruary52027Member_019eadcc-a5d2-7a23-963b-7bd09a7beb7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueFebruary92027Member_019eadcc-a5d2-7416-95c8-555ad16aeb79" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueFebruary92027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueFebruary92027Member_019eadcc-a5d2-7416-95c8-555ad16aeb79" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueFebruary172027Member_019eadcc-a5d2-730f-96cc-147b29ad1d9c" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueFebruary172027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueFebruary172027Member_019eadcc-a5d2-730f-96cc-147b29ad1d9c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueFebruary192027Member_019eadcc-a5d2-7178-9037-764f77e369f3" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueFebruary192027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueFebruary192027Member_019eadcc-a5d2-7178-9037-764f77e369f3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueMay142027Member_019eadcc-a5d2-7db0-a99d-333d1a27a784" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueMay142027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueMay142027Member_019eadcc-a5d2-7db0-a99d-333d1a27a784" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueJune152027Member_019eadcc-a5d2-706d-8eef-9e23b8ec09f1" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueJune152027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueJune152027Member_019eadcc-a5d2-706d-8eef-9e23b8ec09f1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueAugust32027Member_019eadcc-a5d2-7509-9140-37eee6dbbb43" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueAugust32027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueAugust32027Member_019eadcc-a5d2-7509-9140-37eee6dbbb43" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditDueNovember262027Member_019eadcc-a5d2-7f59-a929-c7da8cdefcb4" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditDueNovember262027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditDueNovember262027Member_019eadcc-a5d2-7f59-a929-c7da8cdefcb4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditWithEarlyFundingASAPMember_019eadcc-a5d2-7ea3-84ac-3246a5bc6e5d" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditWithEarlyFundingASAPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditWithEarlyFundingASAPMember_019eadcc-a5d2-7ea3-84ac-3246a5bc6e5d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditWithEarlyFundingEFMember_019eadcc-a5d2-765c-8de3-1dea878bf4f6" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditWithEarlyFundingEFMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_LineOfCreditWithEarlyFundingEFMember_019eadcc-a5d2-765c-8de3-1dea878bf4f6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MRAFacilityAndConventionalMSRFacilityMember_019fd4b6-0d20-729a-8afd-a36706008df9" xlink:href="uwmc-20260630.xsd#uwmc_MRAFacilityAndConventionalMSRFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-740d-9a23-8389afd1ccf9" xlink:to="loc_uwmc_MRAFacilityAndConventionalMSRFacilityMember_019fd4b6-0d20-729a-8afd-a36706008df9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019eadcc-a5d2-7a1f-aa63-3a74aa2bcbd3" 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_LineOfCreditFacilityTable_019eadcc-a5d2-7228-90bc-ce943c5062d5" xlink:to="loc_srt_RangeAxis_019eadcc-a5d2-7a1f-aa63-3a74aa2bcbd3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a5d2-7a1f-aa63-3a74aa2bcbd3_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_019eadcc-a5d2-7a1f-aa63-3a74aa2bcbd3" xlink:to="loc_srt_RangeMember_019eadcc-a5d2-7a1f-aa63-3a74aa2bcbd3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a5d2-7e1d-b2b4-b4438a795d27" 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_019eadcc-a5d2-7a1f-aa63-3a74aa2bcbd3" xlink:to="loc_srt_RangeMember_019eadcc-a5d2-7e1d-b2b4-b4438a795d27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019eadcc-a5d2-7c72-b278-1168e4df793c" 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_019eadcc-a5d2-7e1d-b2b4-b4438a795d27" xlink:to="loc_srt_MinimumMember_019eadcc-a5d2-7c72-b278-1168e4df793c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019eadcc-a5d2-7126-a8ab-a369f40a0e22" 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_019eadcc-a5d2-7e1d-b2b4-b4438a795d27" xlink:to="loc_srt_MaximumMember_019eadcc-a5d2-7126-a8ab-a369f40a0e22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019fd4ee-d0dd-72ff-bff1-944207230c66" 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_LineOfCreditFacilityTable_019eadcc-a5d2-7228-90bc-ce943c5062d5" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019fd4ee-d0dd-72ff-bff1-944207230c66" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019fd4ee-d0dd-72ff-bff1-944207230c66_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_019fd4ee-d0dd-72ff-bff1-944207230c66" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019fd4ee-d0dd-72ff-bff1-944207230c66_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019fd4ee-d0dd-7a98-b859-bdde46733950" 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_019fd4ee-d0dd-72ff-bff1-944207230c66" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019fd4ee-d0dd-7a98-b859-bdde46733950" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019fd4ef-2d07-788b-81df-b73817e7a0af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019fd4ee-d0dd-7a98-b859-bdde46733950" xlink:to="loc_us-gaap_LineOfCreditMember_019fd4ef-2d07-788b-81df-b73817e7a0af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019eadcc-a5d2-7c04-86ca-6fdd5e7caa67" 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_019eadcc-a5d2-7477-83c1-92bd861fc8b8" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019eadcc-a5d2-7c04-86ca-6fdd5e7caa67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019eadcc-a5d2-7e91-bdc1-77c8ef3ea9d6" 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_LineOfCreditFacilityLineItems_019eadcc-a5d2-7477-83c1-92bd861fc8b8" xlink:to="loc_us-gaap_LineOfCredit_019eadcc-a5d2-7e91-bdc1-77c8ef3ea9d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_019eadcc-a5d2-7a86-8d74-343e815a8a32" 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_019eadcc-a5d2-7477-83c1-92bd861fc8b8" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_019eadcc-a5d2-7a86-8d74-343e815a8a32" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019eadcc-a5d2-7ca6-a76a-c8a34c5df8a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019eadcc-a5d2-7477-83c1-92bd861fc8b8" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019eadcc-a5d2-7ca6-a76a-c8a34c5df8a6" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/WarehouseandOtherSecuredLinesofCreditAdditionalInformationDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#WarehouseandOtherSecuredLinesofCreditAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/WarehouseandOtherSecuredLinesofCreditAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_019eadcc-a5d2-74b8-96fb-6a532b76cc62" 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_019eadcc-a5d2-70f4-8ec1-afcc05063dcb" 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_019eadcc-a5d2-74b8-96fb-6a532b76cc62" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_019eadcc-a5d2-70f4-8ec1-afcc05063dcb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019eadcc-a5d2-784b-a523-655ab655fa6c" 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_LineOfCreditFacilityTable_019eadcc-a5d2-70f4-8ec1-afcc05063dcb" xlink:to="loc_us-gaap_CreditFacilityAxis_019eadcc-a5d2-784b-a523-655ab655fa6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-784b-a523-655ab655fa6c_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_019eadcc-a5d2-784b-a523-655ab655fa6c" xlink:to="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-784b-a523-655ab655fa6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-708b-8f37-280b7da11e7f" 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_019eadcc-a5d2-784b-a523-655ab655fa6c" xlink:to="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-708b-8f37-280b7da11e7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_WarehouseLineOfCreditMember_019eadcc-a5d2-7137-9837-cd2b140b84bd" xlink:href="uwmc-20260630.xsd#uwmc_WarehouseLineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-708b-8f37-280b7da11e7f" xlink:to="loc_uwmc_WarehouseLineOfCreditMember_019eadcc-a5d2-7137-9837-cd2b140b84bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019eadcc-a5d2-7fb9-a6c4-e88735a1273a" 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_019eadcc-a5d2-708b-8f37-280b7da11e7f" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019eadcc-a5d2-7fb9-a6c4-e88735a1273a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019eadcc-a5d2-7670-b04a-b7dbe2f4ddf2" 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_019eadcc-a5d2-70f4-8ec1-afcc05063dcb" xlink:to="loc_us-gaap_DebtInstrumentAxis_019eadcc-a5d2-7670-b04a-b7dbe2f4ddf2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7670-b04a-b7dbe2f4ddf2_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_019eadcc-a5d2-7670-b04a-b7dbe2f4ddf2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7670-b04a-b7dbe2f4ddf2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-70fe-bc1c-424a3836e661" 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_019eadcc-a5d2-7670-b04a-b7dbe2f4ddf2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-70fe-bc1c-424a3836e661" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditWithEarlyFundingASAPMember_019eadcc-a5d2-7bcf-80fb-ba0fef900bce" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditWithEarlyFundingASAPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-70fe-bc1c-424a3836e661" xlink:to="loc_uwmc_LineOfCreditWithEarlyFundingASAPMember_019eadcc-a5d2-7bcf-80fb-ba0fef900bce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditWithEarlyFundingEFMember_019eadcc-a5d2-7df2-92b4-52222cdbef11" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditWithEarlyFundingEFMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-70fe-bc1c-424a3836e661" xlink:to="loc_uwmc_LineOfCreditWithEarlyFundingEFMember_019eadcc-a5d2-7df2-92b4-52222cdbef11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MSRFacilityMember_019eadcc-a5d2-784b-ad15-41783c16f4b8" xlink:href="uwmc-20260630.xsd#uwmc_MSRFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-70fe-bc1c-424a3836e661" xlink:to="loc_uwmc_MSRFacilityMember_019eadcc-a5d2-784b-ad15-41783c16f4b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_GNMAMSRFacilityMember_019eadcc-a5d2-7338-9fc8-fb09def7e026" xlink:href="uwmc-20260630.xsd#uwmc_GNMAMSRFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-70fe-bc1c-424a3836e661" xlink:to="loc_uwmc_GNMAMSRFacilityMember_019eadcc-a5d2-7338-9fc8-fb09def7e026" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a5d2-7ad4-bdc6-61fdeef20e97" 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_LineOfCreditFacilityTable_019eadcc-a5d2-70f4-8ec1-afcc05063dcb" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a5d2-7ad4-bdc6-61fdeef20e97" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7ad4-bdc6-61fdeef20e97_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_019eadcc-a5d2-7ad4-bdc6-61fdeef20e97" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7ad4-bdc6-61fdeef20e97_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7a31-bdfa-60a5f82b8e77" 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_019eadcc-a5d2-7ad4-bdc6-61fdeef20e97" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7a31-bdfa-60a5f82b8e77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019eadcc-a5d2-79f0-9dd6-4a0452dd72ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7a31-bdfa-60a5f82b8e77" xlink:to="loc_us-gaap_LineOfCreditMember_019eadcc-a5d2-79f0-9dd6-4a0452dd72ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019eadcc-a5d2-7163-a60f-3d036568e88f" 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_LineOfCreditFacilityLineItems_019eadcc-a5d2-74b8-96fb-6a532b76cc62" xlink:to="loc_us-gaap_LineOfCredit_019eadcc-a5d2-7163-a60f-3d036568e88f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019eadcc-a5d2-72f1-806c-943c33431f46" 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_019eadcc-a5d2-74b8-96fb-6a532b76cc62" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019eadcc-a5d2-72f1-806c-943c33431f46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtWeightedAverageInterestRateOverTime_019eadcc-a5d2-7b72-a7d4-485c6cf51069" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtWeightedAverageInterestRateOverTime"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_019eadcc-a5d2-74b8-96fb-6a532b76cc62" xlink:to="loc_us-gaap_LongTermDebtWeightedAverageInterestRateOverTime_019eadcc-a5d2-7b72-a7d4-485c6cf51069" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/OtherBorrowingsSummaryofSeniorUnsecuredNotesDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#OtherBorrowingsSummaryofSeniorUnsecuredNotesDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/OtherBorrowingsSummaryofSeniorUnsecuredNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019eadcc-a5d2-7155-96a9-f0bc701bcd06" 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_019eadcc-a5d2-7cd3-ae68-4669005a08bd" 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_019eadcc-a5d2-7155-96a9-f0bc701bcd06" xlink:to="loc_us-gaap_DebtInstrumentTable_019eadcc-a5d2-7cd3-ae68-4669005a08bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a5d2-7058-add5-57a2256c449a" 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_019eadcc-a5d2-7cd3-ae68-4669005a08bd" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a5d2-7058-add5-57a2256c449a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7058-add5-57a2256c449a_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_019eadcc-a5d2-7058-add5-57a2256c449a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7058-add5-57a2256c449a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7ccc-8123-3e45cb00720d" 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_019eadcc-a5d2-7058-add5-57a2256c449a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7ccc-8123-3e45cb00720d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019eadcc-a5d2-749b-924d-62f28a17cec8" 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_LongtermDebtTypeDomain_019eadcc-a5d2-7ccc-8123-3e45cb00720d" xlink:to="loc_us-gaap_SeniorNotesMember_019eadcc-a5d2-749b-924d-62f28a17cec8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019eadcc-a5d2-7836-b7f6-73f1cda690a4" 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_019eadcc-a5d2-7cd3-ae68-4669005a08bd" xlink:to="loc_us-gaap_DebtInstrumentAxis_019eadcc-a5d2-7836-b7f6-73f1cda690a4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7836-b7f6-73f1cda690a4_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_019eadcc-a5d2-7836-b7f6-73f1cda690a4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7836-b7f6-73f1cda690a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7f8c-98d1-b4748f20e91a" 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_019eadcc-a5d2-7836-b7f6-73f1cda690a4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7f8c-98d1-b4748f20e91a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueJune152027Member_019eadcc-a5d2-7539-ab33-7837f195f85a" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueJune152027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7f8c-98d1-b4748f20e91a" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueJune152027Member_019eadcc-a5d2-7539-ab33-7837f195f85a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueApril152029Member_019eadcc-a5d2-7039-a42d-d1d8187b2ea3" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueApril152029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7f8c-98d1-b4748f20e91a" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueApril152029Member_019eadcc-a5d2-7039-a42d-d1d8187b2ea3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueFebruary12030Member_019eadcc-a5d2-7307-baae-5cb0bad4a6b2" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueFebruary12030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7f8c-98d1-b4748f20e91a" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueFebruary12030Member_019eadcc-a5d2-7307-baae-5cb0bad4a6b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueMarch152031Member_019eadcc-a5d2-7b46-ad7d-9238bf619418" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueMarch152031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7f8c-98d1-b4748f20e91a" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueMarch152031Member_019eadcc-a5d2-7b46-ad7d-9238bf619418" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019eadcc-a5d2-7d54-9df6-e33e0bfa82e0" 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_019eadcc-a5d2-7155-96a9-f0bc701bcd06" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019eadcc-a5d2-7d54-9df6-e33e0bfa82e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019eadcc-a5d2-77ed-87dc-9e18fbd08703" 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_019eadcc-a5d2-7155-96a9-f0bc701bcd06" xlink:to="loc_us-gaap_LongTermDebt_019eadcc-a5d2-77ed-87dc-9e18fbd08703" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019eadcc-a5d2-7588-8110-f23fa5ac2637" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019eadcc-a5d2-7155-96a9-f0bc701bcd06" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019eadcc-a5d2-7588-8110-f23fa5ac2637" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019eadcc-a5d2-7251-9819-896ffb685bf3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019eadcc-a5d2-7155-96a9-f0bc701bcd06" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019eadcc-a5d2-7251-9819-896ffb685bf3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019eadcc-a5d2-7771-b574-cf055f3f96e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019eadcc-a5d2-7155-96a9-f0bc701bcd06" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019eadcc-a5d2-7771-b574-cf055f3f96e0" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/OtherBorrowingsAdditionalInformationDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#OtherBorrowingsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/OtherBorrowingsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019eadcc-a5d2-70ff-9c16-179e4d20da63" 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_019eadcc-a5d2-74a6-8980-f5c1f189a2ce" 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_019eadcc-a5d2-70ff-9c16-179e4d20da63" xlink:to="loc_us-gaap_DebtInstrumentTable_019eadcc-a5d2-74a6-8980-f5c1f189a2ce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a5d2-7f3b-81fb-24bc66794fb5" 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_019eadcc-a5d2-74a6-8980-f5c1f189a2ce" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a5d2-7f3b-81fb-24bc66794fb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7f3b-81fb-24bc66794fb5_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_019eadcc-a5d2-7f3b-81fb-24bc66794fb5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7f3b-81fb-24bc66794fb5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7069-8a95-5a09f56ee0ba" 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_019eadcc-a5d2-7f3b-81fb-24bc66794fb5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7069-8a95-5a09f56ee0ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019eadcc-a5d2-7996-be62-6648b694542b" 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_LongtermDebtTypeDomain_019eadcc-a5d2-7069-8a95-5a09f56ee0ba" xlink:to="loc_us-gaap_SeniorNotesMember_019eadcc-a5d2-7996-be62-6648b694542b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019eadcc-a5d2-7673-a407-6445cc43a525" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7069-8a95-5a09f56ee0ba" xlink:to="loc_us-gaap_LineOfCreditMember_019eadcc-a5d2-7673-a407-6445cc43a525" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019eadcc-a5d2-7280-834f-0a4756688254" 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_019eadcc-a5d2-74a6-8980-f5c1f189a2ce" xlink:to="loc_us-gaap_DebtInstrumentAxis_019eadcc-a5d2-7280-834f-0a4756688254" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7280-834f-0a4756688254_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_019eadcc-a5d2-7280-834f-0a4756688254" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-7280-834f-0a4756688254_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-716d-809d-09b825b86347" 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_019eadcc-a5d2-7280-834f-0a4756688254" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-716d-809d-09b825b86347" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueApril152029Member_019eadcc-a5d2-7da1-aff7-046038d621e1" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueApril152029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-716d-809d-09b825b86347" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueApril152029Member_019eadcc-a5d2-7da1-aff7-046038d621e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueJune152027Member_019eadcc-a5d2-7ff7-893e-38b3710c184f" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueJune152027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-716d-809d-09b825b86347" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueJune152027Member_019eadcc-a5d2-7ff7-893e-38b3710c184f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueFebruary12030Member_019eadcc-a5d2-7efe-b059-0e7bb83aa647" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueFebruary12030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-716d-809d-09b825b86347" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueFebruary12030Member_019eadcc-a5d2-7efe-b059-0e7bb83aa647" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueMarch152031Member_019eadcc-a5d2-7e67-9def-0afb1d43a585" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueMarch152031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-716d-809d-09b825b86347" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueMarch152031Member_019eadcc-a5d2-7e67-9def-0afb1d43a585" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_RevolvingCreditAgreementMember_019eadcc-a5d2-7286-8deb-7250bcdf4b7b" xlink:href="uwmc-20260630.xsd#uwmc_RevolvingCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a5d2-716d-809d-09b825b86347" xlink:to="loc_uwmc_RevolvingCreditAgreementMember_019eadcc-a5d2-7286-8deb-7250bcdf4b7b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019eadcc-a5d2-793c-8dc7-ad05a8b75bda" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019eadcc-a5d2-74a6-8980-f5c1f189a2ce" xlink:to="loc_srt_StatementScenarioAxis_019eadcc-a5d2-793c-8dc7-ad05a8b75bda" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019eadcc-a5d2-793c-8dc7-ad05a8b75bda_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019eadcc-a5d2-793c-8dc7-ad05a8b75bda" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019eadcc-a5d2-793c-8dc7-ad05a8b75bda_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019eadcc-a5d2-7fe1-89b1-d7dd4aaebe4b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019eadcc-a5d2-793c-8dc7-ad05a8b75bda" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019eadcc-a5d2-7fe1-89b1-d7dd4aaebe4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019eadcc-a5d2-70f4-98f7-a35db2bf6663" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019eadcc-a5d2-7fe1-89b1-d7dd4aaebe4b" xlink:to="loc_srt_ScenarioForecastMember_019eadcc-a5d2-70f4-98f7-a35db2bf6663" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019eadcc-a5d2-741a-aa7d-4035d7895b38" 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_019eadcc-a5d2-74a6-8980-f5c1f189a2ce" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_019eadcc-a5d2-741a-aa7d-4035d7895b38" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019eadcc-a5d2-741a-aa7d-4035d7895b38_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_019eadcc-a5d2-741a-aa7d-4035d7895b38" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019eadcc-a5d2-741a-aa7d-4035d7895b38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019eadcc-a5d2-7fa6-8307-b7c6ae4576dd" 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_019eadcc-a5d2-741a-aa7d-4035d7895b38" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019eadcc-a5d2-7fa6-8307-b7c6ae4576dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_019eadcc-a5d2-7484-b82b-b0bdc6132c59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019eadcc-a5d2-7fa6-8307-b7c6ae4576dd" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_019eadcc-a5d2-7484-b82b-b0bdc6132c59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_019eadcc-a5d2-7d28-99f0-de1c1172d2df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019eadcc-a5d2-7fa6-8307-b7c6ae4576dd" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_019eadcc-a5d2-7d28-99f0-de1c1172d2df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_019eadcc-a5d2-7bcb-9cb5-fe8960e7d654" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRedemptionPeriodThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_019eadcc-a5d2-7fa6-8307-b7c6ae4576dd" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_019eadcc-a5d2-7bcb-9cb5-fe8960e7d654" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019eadcc-a5d2-7f0e-943c-8e2ce633a7fd" 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_019eadcc-a5d2-74a6-8980-f5c1f189a2ce" xlink:to="loc_srt_RangeAxis_019eadcc-a5d2-7f0e-943c-8e2ce633a7fd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a5d2-7f0e-943c-8e2ce633a7fd_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_019eadcc-a5d2-7f0e-943c-8e2ce633a7fd" xlink:to="loc_srt_RangeMember_019eadcc-a5d2-7f0e-943c-8e2ce633a7fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a5d2-7bfc-82d4-bebd99c6ef39" 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_019eadcc-a5d2-7f0e-943c-8e2ce633a7fd" xlink:to="loc_srt_RangeMember_019eadcc-a5d2-7bfc-82d4-bebd99c6ef39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019eadcc-a5d2-76bc-b0a5-45acb0f22a23" 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_019eadcc-a5d2-7bfc-82d4-bebd99c6ef39" xlink:to="loc_srt_MaximumMember_019eadcc-a5d2-76bc-b0a5-45acb0f22a23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019eadcc-a5d2-7ac4-ab45-6d22d32a9023" 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_DebtInstrumentTable_019eadcc-a5d2-74a6-8980-f5c1f189a2ce" xlink:to="loc_us-gaap_CreditFacilityAxis_019eadcc-a5d2-7ac4-ab45-6d22d32a9023" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-7ac4-ab45-6d22d32a9023_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_019eadcc-a5d2-7ac4-ab45-6d22d32a9023" xlink:to="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-7ac4-ab45-6d22d32a9023_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-7aba-bb67-6cd61900acc8" 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_019eadcc-a5d2-7ac4-ab45-6d22d32a9023" xlink:to="loc_us-gaap_CreditFacilityDomain_019eadcc-a5d2-7aba-bb67-6cd61900acc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019eadcc-a5d2-749b-bfaa-d3bcffc6f8de" 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_019eadcc-a5d2-7aba-bb67-6cd61900acc8" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019eadcc-a5d2-749b-bfaa-d3bcffc6f8de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019eadcc-a5d2-7af7-954a-fb89104a9f49" 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_DebtInstrumentTable_019eadcc-a5d2-74a6-8980-f5c1f189a2ce" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019eadcc-a5d2-7af7-954a-fb89104a9f49" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019eadcc-a5d2-7af7-954a-fb89104a9f49_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_019eadcc-a5d2-7af7-954a-fb89104a9f49" xlink:to="loc_us-gaap_RelatedPartyDomain_019eadcc-a5d2-7af7-954a-fb89104a9f49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019eadcc-a5d2-7c30-8524-108623cf7df2" 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_019eadcc-a5d2-7af7-954a-fb89104a9f49" xlink:to="loc_us-gaap_RelatedPartyDomain_019eadcc-a5d2-7c30-8524-108623cf7df2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019eadcc-a5d2-711d-b7ee-651713d4a53c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019eadcc-a5d2-7c30-8524-108623cf7df2" xlink:to="loc_us-gaap_RelatedPartyMember_019eadcc-a5d2-711d-b7ee-651713d4a53c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_019eadcc-a5d2-7f89-99e8-6029ad1d701d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019eadcc-a5d2-74a6-8980-f5c1f189a2ce" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_019eadcc-a5d2-7f89-99e8-6029ad1d701d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019eadcc-a5d2-7f89-99e8-6029ad1d701d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019eadcc-a5d2-7f89-99e8-6029ad1d701d" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019eadcc-a5d2-7f89-99e8-6029ad1d701d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019eadcc-a5d2-739a-b13c-ead5b7f27899" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019eadcc-a5d2-7f89-99e8-6029ad1d701d" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019eadcc-a5d2-739a-b13c-ead5b7f27899" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SFSCorpMember_019eadcc-a5d2-764b-8ff3-2e64521dd462" xlink:href="uwmc-20260630.xsd#uwmc_SFSCorpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019eadcc-a5d2-739a-b13c-ead5b7f27899" xlink:to="loc_uwmc_SFSCorpMember_019eadcc-a5d2-764b-8ff3-2e64521dd462" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019eadcc-a5d2-77e7-bf86-a04a5c4bdfa7" 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_019eadcc-a5d2-70ff-9c16-179e4d20da63" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019eadcc-a5d2-77e7-bf86-a04a5c4bdfa7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019eadcc-a5d2-7a8b-9efc-01af27cfa4c8" 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_019eadcc-a5d2-70ff-9c16-179e4d20da63" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019eadcc-a5d2-7a8b-9efc-01af27cfa4c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_019eadcc-a5d2-7cf2-ad73-0c61ad417160" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019eadcc-a5d2-70ff-9c16-179e4d20da63" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed_019eadcc-a5d2-7cf2-ad73-0c61ad417160" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_019eadcc-a5d2-7ff3-a25a-c9f6f1f0cd2e" 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_019eadcc-a5d2-70ff-9c16-179e4d20da63" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_019eadcc-a5d2-7ff3-a25a-c9f6f1f0cd2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019eadcc-a5d2-70ba-b0f8-8f6d0accfa87" 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_DebtInstrumentLineItems_019eadcc-a5d2-70ff-9c16-179e4d20da63" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019eadcc-a5d2-70ba-b0f8-8f6d0accfa87" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditFacilityInitialTerm_019eadcc-a5d2-7699-867b-f3e3a82bc8fa" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditFacilityInitialTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019eadcc-a5d2-70ff-9c16-179e4d20da63" xlink:to="loc_uwmc_LineOfCreditFacilityInitialTerm_019eadcc-a5d2-7699-867b-f3e3a82bc8fa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_LineOfCreditFacilityRenewalTerm_019eadcc-a5d2-7a00-98c8-853c18dd042d" xlink:href="uwmc-20260630.xsd#uwmc_LineOfCreditFacilityRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019eadcc-a5d2-70ff-9c16-179e4d20da63" xlink:to="loc_uwmc_LineOfCreditFacilityRenewalTerm_019eadcc-a5d2-7a00-98c8-853c18dd042d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019eadcc-a5d2-7d39-8316-28a7a0009d1c" 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_019eadcc-a5d2-70ff-9c16-179e4d20da63" xlink:to="loc_us-gaap_LongTermDebt_019eadcc-a5d2-7d39-8316-28a7a0009d1c" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/VariableInterestEntitiesDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#VariableInterestEntitiesDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/VariableInterestEntitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019eadcc-a5d2-7ff4-a41c-b4e6fd9c3a6f" 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_019eadcc-a5d2-7925-a882-a25267d0ceea" 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_019eadcc-a5d2-7ff4-a41c-b4e6fd9c3a6f" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019eadcc-a5d2-7925-a882-a25267d0ceea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019eadcc-a5d2-782d-a1ca-6cd5e2265bf7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019eadcc-a5d2-7925-a882-a25267d0ceea" xlink:to="loc_dei_LegalEntityAxis_019eadcc-a5d2-782d-a1ca-6cd5e2265bf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019eadcc-a5d2-782d-a1ca-6cd5e2265bf7_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019eadcc-a5d2-782d-a1ca-6cd5e2265bf7" xlink:to="loc_dei_EntityDomain_019eadcc-a5d2-782d-a1ca-6cd5e2265bf7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019eadcc-a5d2-7b9b-a261-beea117fe70c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019eadcc-a5d2-782d-a1ca-6cd5e2265bf7" xlink:to="loc_dei_EntityDomain_019eadcc-a5d2-7b9b-a261-beea117fe70c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_HoldingsLLCMember_019eadcc-a5d2-7d54-957c-29cca96ae9a9" xlink:href="uwmc-20260630.xsd#uwmc_HoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019eadcc-a5d2-7b9b-a261-beea117fe70c" xlink:to="loc_uwmc_HoldingsLLCMember_019eadcc-a5d2-7d54-957c-29cca96ae9a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019eadcc-a5d2-79ba-a0a2-70f89273f6e7" 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_ScheduleOfVariableInterestEntitiesTable_019eadcc-a5d2-7925-a882-a25267d0ceea" xlink:to="loc_srt_RangeAxis_019eadcc-a5d2-79ba-a0a2-70f89273f6e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a5d2-79ba-a0a2-70f89273f6e7_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_019eadcc-a5d2-79ba-a0a2-70f89273f6e7" xlink:to="loc_srt_RangeMember_019eadcc-a5d2-79ba-a0a2-70f89273f6e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a5d2-7ff1-a45d-04bb9fb76628" 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_019eadcc-a5d2-79ba-a0a2-70f89273f6e7" xlink:to="loc_srt_RangeMember_019eadcc-a5d2-7ff1-a45d-04bb9fb76628" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019eadcc-a5d2-7396-955c-ecfc062d6b5c" 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_019eadcc-a5d2-7ff1-a45d-04bb9fb76628" xlink:to="loc_srt_MinimumMember_019eadcc-a5d2-7396-955c-ecfc062d6b5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019eadcc-a5d2-73e0-bc62-fe98d9c9d2c3" 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_019eadcc-a5d2-7ff1-a45d-04bb9fb76628" xlink:to="loc_srt_MaximumMember_019eadcc-a5d2-73e0-bc62-fe98d9c9d2c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a5d2-7646-93cc-72aa27e84b36" 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_ScheduleOfVariableInterestEntitiesTable_019eadcc-a5d2-7925-a882-a25267d0ceea" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a5d2-7646-93cc-72aa27e84b36" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7646-93cc-72aa27e84b36_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_019eadcc-a5d2-7646-93cc-72aa27e84b36" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-7646-93cc-72aa27e84b36_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-769e-a22e-e98ffb2ea211" 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_019eadcc-a5d2-7646-93cc-72aa27e84b36" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-769e-a22e-e98ffb2ea211" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019eadcc-a5d2-7ba3-810f-177c21ddd836" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a5d2-769e-a22e-e98ffb2ea211" xlink:to="loc_us-gaap_SecuredDebtMember_019eadcc-a5d2-7ba3-810f-177c21ddd836" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityOwnershipPercentage_019eadcc-a5d2-7576-b100-47a72420cfe5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019eadcc-a5d2-7ff4-a41c-b4e6fd9c3a6f" xlink:to="loc_us-gaap_VariableInterestEntityOwnershipPercentage_019eadcc-a5d2-7576-b100-47a72420cfe5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_PercentageOfBeneficialInterestInSecuritizedAssets_019eadcc-a5d2-71bc-b338-264fda8a4399" xlink:href="uwmc-20260630.xsd#uwmc_PercentageOfBeneficialInterestInSecuritizedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019eadcc-a5d2-7ff4-a41c-b4e6fd9c3a6f" xlink:to="loc_uwmc_PercentageOfBeneficialInterestInSecuritizedAssets_019eadcc-a5d2-71bc-b338-264fda8a4399" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesLoanedFairValueOfCollateral_019eadcc-a5d2-7c30-b2f2-961ffad6d6f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuritiesLoanedFairValueOfCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019eadcc-a5d2-7ff4-a41c-b4e6fd9c3a6f" xlink:to="loc_us-gaap_SecuritiesLoanedFairValueOfCollateral_019eadcc-a5d2-7c30-b2f2-961ffad6d6f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_RetainedInterest_019eadcc-a5d2-7e7d-900e-96100dc0b5b2" xlink:href="uwmc-20260630.xsd#uwmc_RetainedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019eadcc-a5d2-7ff4-a41c-b4e6fd9c3a6f" xlink:to="loc_uwmc_RetainedInterest_019eadcc-a5d2-7e7d-900e-96100dc0b5b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_019eadcc-a5d2-7932-b17d-614038316946" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019eadcc-a5d2-7ff4-a41c-b4e6fd9c3a6f" xlink:to="loc_us-gaap_SecuredDebt_019eadcc-a5d2-7932-b17d-614038316946" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019eadcc-a5d2-734a-b3a7-ce88d0b3d989" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019eadcc-a5d2-7ff4-a41c-b4e6fd9c3a6f" xlink:to="loc_us-gaap_DebtInstrumentTerm_019eadcc-a5d2-734a-b3a7-ce88d0b3d989" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/NoncontrollingInterestsDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#NoncontrollingInterestsDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/NoncontrollingInterestsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestLineItems_019eadcc-a687-7a51-9048-77181c8c4d91" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestTable_019eadcc-a687-7291-a522-e6daa0a21684" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MinorityInterestLineItems_019eadcc-a687-7a51-9048-77181c8c4d91" xlink:to="loc_us-gaap_MinorityInterestTable_019eadcc-a687-7291-a522-e6daa0a21684" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_019eadcc-a687-759a-94a1-016a793ba5e3" 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_MinorityInterestTable_019eadcc-a687-7291-a522-e6daa0a21684" xlink:to="loc_srt_OwnershipAxis_019eadcc-a687-759a-94a1-016a793ba5e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019eadcc-a687-759a-94a1-016a793ba5e3_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_019eadcc-a687-759a-94a1-016a793ba5e3" xlink:to="loc_srt_OwnershipDomain_019eadcc-a687-759a-94a1-016a793ba5e3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019eadcc-a687-78be-b394-bf85f7fc5725" 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_019eadcc-a687-759a-94a1-016a793ba5e3" xlink:to="loc_srt_OwnershipDomain_019eadcc-a687-78be-b394-bf85f7fc5725" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_HoldingsLLCMember_019eadcc-a687-7220-993b-7e6f9fca46f4" xlink:href="uwmc-20260630.xsd#uwmc_HoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019eadcc-a687-78be-b394-bf85f7fc5725" xlink:to="loc_uwmc_HoldingsLLCMember_019eadcc-a687-7220-993b-7e6f9fca46f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a687-7527-9b6e-9ea355dda51c" 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_MinorityInterestTable_019eadcc-a687-7291-a522-e6daa0a21684" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a687-7527-9b6e-9ea355dda51c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7527-9b6e-9ea355dda51c_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_019eadcc-a687-7527-9b6e-9ea355dda51c" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7527-9b6e-9ea355dda51c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-72a9-8b81-a4fc8c91ba1f" 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_019eadcc-a687-7527-9b6e-9ea355dda51c" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-72a9-8b81-a4fc8c91ba1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019eadcc-a687-72b3-af18-6c617dc52bce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-72a9-8b81-a4fc8c91ba1f" xlink:to="loc_us-gaap_CommonClassAMember_019eadcc-a687-72b3-af18-6c617dc52bce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019eadcc-a687-711a-acb2-72e0a6bb2bf2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-72a9-8b81-a4fc8c91ba1f" xlink:to="loc_us-gaap_CommonClassBMember_019eadcc-a687-711a-acb2-72e0a6bb2bf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019eadcc-a687-7ff7-83aa-0974524799d2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MinorityInterestTable_019eadcc-a687-7291-a522-e6daa0a21684" xlink:to="loc_dei_LegalEntityAxis_019eadcc-a687-7ff7-83aa-0974524799d2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019eadcc-a687-7ff7-83aa-0974524799d2_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019eadcc-a687-7ff7-83aa-0974524799d2" xlink:to="loc_dei_EntityDomain_019eadcc-a687-7ff7-83aa-0974524799d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019eadcc-a687-7029-be38-f18ffe2071c9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019eadcc-a687-7ff7-83aa-0974524799d2" xlink:to="loc_dei_EntityDomain_019eadcc-a687-7029-be38-f18ffe2071c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SFSCorpMember_019eadcc-a687-7ad1-ac40-b5b07ecc02aa" xlink:href="uwmc-20260630.xsd#uwmc_SFSCorpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019eadcc-a687-7029-be38-f18ffe2071c9" xlink:to="loc_uwmc_SFSCorpMember_019eadcc-a687-7ad1-ac40-b5b07ecc02aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7089-b2f6-009ce6bfdebf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MinorityInterestTable_019eadcc-a687-7291-a522-e6daa0a21684" xlink:to="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7089-b2f6-009ce6bfdebf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7089-b2f6-009ce6bfdebf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7089-b2f6-009ce6bfdebf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7089-b2f6-009ce6bfdebf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7eb1-be18-826e5f24e206" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7089-b2f6-009ce6bfdebf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7eb1-be18-826e5f24e206" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019eadcc-a687-7d5b-aa09-da9a3c49540a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7eb1-be18-826e5f24e206" xlink:to="loc_us-gaap_CommonClassBMember_019eadcc-a687-7d5b-aa09-da9a3c49540a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonUnitOutstanding_019eadcc-a687-71f4-988a-c85a19201f5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonUnitOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MinorityInterestLineItems_019eadcc-a687-7a51-9048-77181c8c4d91" xlink:to="loc_us-gaap_CommonUnitOutstanding_019eadcc-a687-71f4-988a-c85a19201f5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_019eadcc-a687-7076-a5b1-739afd50e0f9" 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_MinorityInterestLineItems_019eadcc-a687-7a51-9048-77181c8c4d91" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_019eadcc-a687-7076-a5b1-739afd50e0f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_019eadcc-a687-74fb-930d-d23ce4254303" 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_MinorityInterestLineItems_019eadcc-a687-7a51-9048-77181c8c4d91" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_019eadcc-a687-74fb-930d-d23ce4254303" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_NoncontrollingInterestOwnershipPercentage_019eadcc-a687-7aad-99e9-2e77e9536542" xlink:href="uwmc-20260630.xsd#uwmc_NoncontrollingInterestOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MinorityInterestLineItems_019eadcc-a687-7a51-9048-77181c8c4d91" xlink:to="loc_uwmc_NoncontrollingInterestOwnershipPercentage_019eadcc-a687-7aad-99e9-2e77e9536542" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/NoncontrollingInterestsNarrativeDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#NoncontrollingInterestsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/NoncontrollingInterestsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestLineItems_019eadcc-a687-7830-92a0-6a916f056669" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestTable_019eadcc-a687-7f47-af7e-0836c1ee0cb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MinorityInterestLineItems_019eadcc-a687-7830-92a0-6a916f056669" xlink:to="loc_us-gaap_MinorityInterestTable_019eadcc-a687-7f47-af7e-0836c1ee0cb9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7308-a6df-8789c55988d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MinorityInterestTable_019eadcc-a687-7f47-af7e-0836c1ee0cb9" xlink:to="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7308-a6df-8789c55988d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7308-a6df-8789c55988d0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7308-a6df-8789c55988d0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7308-a6df-8789c55988d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7e19-8bc1-b61fb805c9ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7308-a6df-8789c55988d0" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7e19-8bc1-b61fb805c9ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019eadcc-a687-7e96-bf36-cc9a7c54ff36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7e19-8bc1-b61fb805c9ec" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019eadcc-a687-7e96-bf36-cc9a7c54ff36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a687-7760-8e83-a27b805865cd" 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_MinorityInterestTable_019eadcc-a687-7f47-af7e-0836c1ee0cb9" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a687-7760-8e83-a27b805865cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7760-8e83-a27b805865cd_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_019eadcc-a687-7760-8e83-a27b805865cd" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7760-8e83-a27b805865cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7bf9-b6e6-00c1a9f0249d" 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_019eadcc-a687-7760-8e83-a27b805865cd" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7bf9-b6e6-00c1a9f0249d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019eadcc-a687-79d6-bbb7-f48ea1ad4579" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7bf9-b6e6-00c1a9f0249d" xlink:to="loc_us-gaap_CommonClassBMember_019eadcc-a687-79d6-bbb7-f48ea1ad4579" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNetVestedInPeriod_019eadcc-a687-7074-aa90-db24bcbf40c5" xlink:href="uwmc-20260630.xsd#uwmc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNetVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MinorityInterestLineItems_019eadcc-a687-7830-92a0-6a916f056669" xlink:to="loc_uwmc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNetVestedInPeriod_019eadcc-a687-7074-aa90-db24bcbf40c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterestSharesIssuedDuringPeriod_019eadcc-a687-775d-a87d-cbc98ae5528f" xlink:href="uwmc-20260630.xsd#uwmc_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterestSharesIssuedDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MinorityInterestLineItems_019eadcc-a687-7830-92a0-6a916f056669" xlink:to="loc_uwmc_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterestSharesIssuedDuringPeriod_019eadcc-a687-775d-a87d-cbc98ae5528f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/RegulatoryNetWorthRequirementsAdditionalDetailsDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#RegulatoryNetWorthRequirementsAdditionalDetailsDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/RegulatoryNetWorthRequirementsAdditionalDetailsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesLineItems_019eadcc-a687-7a4e-8f36-67e125d34479" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesTable_019eadcc-a687-7400-a089-63845c308c4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesLineItems_019eadcc-a687-7a4e-8f36-67e125d34479" xlink:to="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesTable_019eadcc-a687-7400-a089-63845c308c4f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryCapitalRequirementsForMortgageCompaniesBySecondaryMarketInvestorAxis_019eadcc-a687-72f8-b006-4854573ece04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryCapitalRequirementsForMortgageCompaniesBySecondaryMarketInvestorAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesTable_019eadcc-a687-7400-a089-63845c308c4f" xlink:to="loc_us-gaap_RegulatoryCapitalRequirementsForMortgageCompaniesBySecondaryMarketInvestorAxis_019eadcc-a687-72f8-b006-4854573ece04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecondaryMarketInvestorDomain_019eadcc-a687-72f8-b006-4854573ece04_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecondaryMarketInvestorDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RegulatoryCapitalRequirementsForMortgageCompaniesBySecondaryMarketInvestorAxis_019eadcc-a687-72f8-b006-4854573ece04" xlink:to="loc_us-gaap_SecondaryMarketInvestorDomain_019eadcc-a687-72f8-b006-4854573ece04_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecondaryMarketInvestorDomain_019eadcc-a687-7b51-8eea-97ea8a341628" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecondaryMarketInvestorDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RegulatoryCapitalRequirementsForMortgageCompaniesBySecondaryMarketInvestorAxis_019eadcc-a687-72f8-b006-4854573ece04" xlink:to="loc_us-gaap_SecondaryMarketInvestorDomain_019eadcc-a687-7b51-8eea-97ea8a341628" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_FNMAFHLMCAndGNMAMember_019eadcc-a687-7555-8c93-0cc909e2490e" xlink:href="uwmc-20260630.xsd#uwmc_FNMAFHLMCAndGNMAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SecondaryMarketInvestorDomain_019eadcc-a687-7b51-8eea-97ea8a341628" xlink:to="loc_uwmc_FNMAFHLMCAndGNMAMember_019eadcc-a687-7555-8c93-0cc909e2490e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinimumNetWorthRequiredForCompliance_019eadcc-a687-702b-b0ea-fd75ca50ef84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinimumNetWorthRequiredForCompliance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesLineItems_019eadcc-a687-7a4e-8f36-67e125d34479" xlink:to="loc_us-gaap_MinimumNetWorthRequiredForCompliance_019eadcc-a687-702b-b0ea-fd75ca50ef84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_BankingRegulationMortgageBankingLiquidityMinimum_019eadcc-a687-7270-94b3-e605fe4873fc" xlink:href="uwmc-20260630.xsd#uwmc_BankingRegulationMortgageBankingLiquidityMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesLineItems_019eadcc-a687-7a4e-8f36-67e125d34479" xlink:to="loc_uwmc_BankingRegulationMortgageBankingLiquidityMinimum_019eadcc-a687-7270-94b3-e605fe4873fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MinimumCapitalRatio_019eadcc-a687-70fc-b64c-72d27c62b21c" xlink:href="uwmc-20260630.xsd#uwmc_MinimumCapitalRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesLineItems_019eadcc-a687-7a4e-8f36-67e125d34479" xlink:to="loc_uwmc_MinimumCapitalRatio_019eadcc-a687-70fc-b64c-72d27c62b21c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/FairValueMeasurementsScheduleofFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#FairValueMeasurementsScheduleofFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/FairValueMeasurementsScheduleofFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eadcc-a687-7af2-b302-dd3e6d79639f" 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_019eadcc-a687-726c-81e9-81c8e917d308" 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_019eadcc-a687-7af2-b302-dd3e6d79639f" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019eadcc-a687-726c-81e9-81c8e917d308" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019eadcc-a687-753e-86d6-8461c293753b" 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_019eadcc-a687-726c-81e9-81c8e917d308" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019eadcc-a687-753e-86d6-8461c293753b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eadcc-a687-753e-86d6-8461c293753b_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_019eadcc-a687-753e-86d6-8461c293753b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eadcc-a687-753e-86d6-8461c293753b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eadcc-a687-7d87-b3dc-c381a06cd0c8" 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_019eadcc-a687-753e-86d6-8461c293753b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eadcc-a687-7d87-b3dc-c381a06cd0c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019eadcc-a687-7638-8b78-71dd908db2b9" 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_019eadcc-a687-7d87-b3dc-c381a06cd0c8" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019eadcc-a687-7638-8b78-71dd908db2b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019eadcc-a687-7fa1-ad32-fb98a2e0dded" 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_019eadcc-a687-7d87-b3dc-c381a06cd0c8" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019eadcc-a687-7fa1-ad32-fb98a2e0dded" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019eadcc-a687-7485-adf3-3a8c6c8e0dda" 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_019eadcc-a687-7d87-b3dc-c381a06cd0c8" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019eadcc-a687-7485-adf3-3a8c6c8e0dda" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a687-722c-a0a5-1a0aa026acd4" 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_019eadcc-a687-726c-81e9-81c8e917d308" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019eadcc-a687-722c-a0a5-1a0aa026acd4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a687-722c-a0a5-1a0aa026acd4_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_019eadcc-a687-722c-a0a5-1a0aa026acd4" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a687-722c-a0a5-1a0aa026acd4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a687-72dd-96eb-594eaf67f42e" 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_019eadcc-a687-722c-a0a5-1a0aa026acd4" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a687-72dd-96eb-594eaf67f42e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateLockCommitmentsMember_019eadcc-a687-7e28-8149-6f590b93975a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateLockCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a687-72dd-96eb-594eaf67f42e" xlink:to="loc_us-gaap_InterestRateLockCommitmentsMember_019eadcc-a687-7e28-8149-6f590b93975a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ForwardLoanSaleCommitmentsMember_019eadcc-a687-7133-b39e-468bd439324a" xlink:href="uwmc-20260630.xsd#uwmc_ForwardLoanSaleCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a687-72dd-96eb-594eaf67f42e" xlink:to="loc_uwmc_ForwardLoanSaleCommitmentsMember_019eadcc-a687-7133-b39e-468bd439324a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MortgageServicingRightsMember_019eadcc-a687-7ecc-8989-85d567981942" xlink:href="uwmc-20260630.xsd#uwmc_MortgageServicingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a687-72dd-96eb-594eaf67f42e" xlink:to="loc_uwmc_MortgageServicingRightsMember_019eadcc-a687-7ecc-8989-85d567981942" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019eadcc-a687-763a-a0cc-90cf95406c22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019eadcc-a687-72dd-96eb-594eaf67f42e" xlink:to="loc_us-gaap_InterestRateContractMember_019eadcc-a687-763a-a0cc-90cf95406c22" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_019eadcc-a687-75e5-b9ce-bc82b9f59820" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgagesHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eadcc-a687-7af2-b302-dd3e6d79639f" xlink:to="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_019eadcc-a687-75e5-b9ce-bc82b9f59820" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_019eadcc-a687-78b4-866d-1788abe7875f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eadcc-a687-7af2-b302-dd3e6d79639f" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_019eadcc-a687-78b4-866d-1788abe7875f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedInterestFairValueDisclosure_019eadcc-a687-7eb3-9184-1edce3a1da4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedInterestFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eadcc-a687-7af2-b302-dd3e6d79639f" xlink:to="loc_us-gaap_RetainedInterestFairValueDisclosure_019eadcc-a687-7eb3-9184-1edce3a1da4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_019eadcc-a687-7a14-af44-547503634b12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eadcc-a687-7af2-b302-dd3e6d79639f" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_019eadcc-a687-7a14-af44-547503634b12" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019eadcc-a687-7a4d-af3b-2ef179daafd5" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eadcc-a687-7af2-b302-dd3e6d79639f" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019eadcc-a687-7a4d-af3b-2ef179daafd5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_019eadcc-a687-7789-9123-fff254a37cf8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eadcc-a687-7af2-b302-dd3e6d79639f" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_019eadcc-a687-7789-9123-fff254a37cf8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_019eadcc-a687-7fb3-a1a1-4142a6b0f8f3" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019eadcc-a687-7af2-b302-dd3e6d79639f" xlink:to="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_019eadcc-a687-7fb3-a1a1-4142a6b0f8f3" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/FairValueMeasurementsQuantitativeInformationDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#FairValueMeasurementsQuantitativeInformationDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/FairValueMeasurementsQuantitativeInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019eadcc-a687-7215-befd-232f4944e400" 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_019eadcc-a687-707d-84be-926fd5f5212e" 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_019eadcc-a687-7215-befd-232f4944e400" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019eadcc-a687-707d-84be-926fd5f5212e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019eadcc-a687-74de-acbc-e859d8b5b13e" 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_019eadcc-a687-707d-84be-926fd5f5212e" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019eadcc-a687-74de-acbc-e859d8b5b13e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019eadcc-a687-74de-acbc-e859d8b5b13e_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_019eadcc-a687-74de-acbc-e859d8b5b13e" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019eadcc-a687-74de-acbc-e859d8b5b13e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019eadcc-a687-7330-bac4-38934afb756f" 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_019eadcc-a687-74de-acbc-e859d8b5b13e" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019eadcc-a687-7330-bac4-38934afb756f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateLockCommitmentsMember_019eadcc-a687-726b-92d8-e13b6a6f3933" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateLockCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019eadcc-a687-7330-bac4-38934afb756f" xlink:to="loc_us-gaap_InterestRateLockCommitmentsMember_019eadcc-a687-726b-92d8-e13b6a6f3933" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019eadcc-a687-7027-a0c7-5cca845fcd90" 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_019eadcc-a687-707d-84be-926fd5f5212e" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019eadcc-a687-7027-a0c7-5cca845fcd90" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019eadcc-a687-7027-a0c7-5cca845fcd90_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_019eadcc-a687-7027-a0c7-5cca845fcd90" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019eadcc-a687-7027-a0c7-5cca845fcd90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019eadcc-a687-76ab-bf41-7d2beb69fe73" 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_019eadcc-a687-7027-a0c7-5cca845fcd90" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019eadcc-a687-76ab-bf41-7d2beb69fe73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MeasurementInputPullThroughRateMember_019eadcc-a687-7dc1-a0c6-06ea3ec4ad62" xlink:href="uwmc-20260630.xsd#uwmc_MeasurementInputPullThroughRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019eadcc-a687-76ab-bf41-7d2beb69fe73" xlink:to="loc_uwmc_MeasurementInputPullThroughRateMember_019eadcc-a687-7dc1-a0c6-06ea3ec4ad62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019eadcc-a687-711f-904b-79face60b6ae" 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_019eadcc-a687-707d-84be-926fd5f5212e" xlink:to="loc_srt_RangeAxis_019eadcc-a687-711f-904b-79face60b6ae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a687-711f-904b-79face60b6ae_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_019eadcc-a687-711f-904b-79face60b6ae" xlink:to="loc_srt_RangeMember_019eadcc-a687-711f-904b-79face60b6ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a687-7c76-9661-611b4dded9e3" 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_019eadcc-a687-711f-904b-79face60b6ae" xlink:to="loc_srt_RangeMember_019eadcc-a687-7c76-9661-611b4dded9e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019eadcc-a687-73ce-b314-8d6afdd638ce" 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_019eadcc-a687-7c76-9661-611b4dded9e3" xlink:to="loc_srt_WeightedAverageMember_019eadcc-a687-73ce-b314-8d6afdd638ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetMeasurementInput_019eadcc-a687-78b7-9092-d27d389a0e44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019eadcc-a687-7215-befd-232f4944e400" xlink:to="loc_us-gaap_DerivativeAssetMeasurementInput_019eadcc-a687-78b7-9092-d27d389a0e44" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/FairValueMeasurementsOtherFinancialInstrumentsDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#FairValueMeasurementsOtherFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/FairValueMeasurementsOtherFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019eadcc-a687-709f-bfee-9d8acbe73438" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019eadcc-a687-7b03-b4a1-5cb33996ba42" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019eadcc-a687-709f-bfee-9d8acbe73438" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019eadcc-a687-7b03-b4a1-5cb33996ba42" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a687-765e-b866-526ba26b1fc9" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019eadcc-a687-7b03-b4a1-5cb33996ba42" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a687-765e-b866-526ba26b1fc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a687-765e-b866-526ba26b1fc9_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_019eadcc-a687-765e-b866-526ba26b1fc9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a687-765e-b866-526ba26b1fc9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a687-7dd3-9c70-41df149f8557" 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_019eadcc-a687-765e-b866-526ba26b1fc9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a687-7dd3-9c70-41df149f8557" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019eadcc-a687-7484-8fc4-3ce0bfde2bd6" 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_LongtermDebtTypeDomain_019eadcc-a687-7dd3-9c70-41df149f8557" xlink:to="loc_us-gaap_SeniorNotesMember_019eadcc-a687-7484-8fc4-3ce0bfde2bd6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019eadcc-a687-734a-b6d7-78938436ae1e" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019eadcc-a687-7b03-b4a1-5cb33996ba42" xlink:to="loc_us-gaap_DebtInstrumentAxis_019eadcc-a687-734a-b6d7-78938436ae1e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-734a-b6d7-78938436ae1e_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_019eadcc-a687-734a-b6d7-78938436ae1e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-734a-b6d7-78938436ae1e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-7fd4-b742-68df7dfd73f9" 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_019eadcc-a687-734a-b6d7-78938436ae1e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-7fd4-b742-68df7dfd73f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueJune152027Member_019eadcc-a687-7191-88d7-a76a6e843c76" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueJune152027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-7fd4-b742-68df7dfd73f9" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueJune152027Member_019eadcc-a687-7191-88d7-a76a6e843c76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueApril152029Member_019eadcc-a687-7966-a6bf-0120a7e6913c" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueApril152029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-7fd4-b742-68df7dfd73f9" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueApril152029Member_019eadcc-a687-7966-a6bf-0120a7e6913c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueFebruary12030Member_019eadcc-a687-71d4-93be-6642318f356e" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueFebruary12030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-7fd4-b742-68df7dfd73f9" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueFebruary12030Member_019eadcc-a687-71d4-93be-6642318f356e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeniorUnsecuredNotesDueMarch152031Member_019eadcc-a687-7c17-afec-00a5749efc6a" xlink:href="uwmc-20260630.xsd#uwmc_SeniorUnsecuredNotesDueMarch152031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-7fd4-b742-68df7dfd73f9" xlink:to="loc_uwmc_SeniorUnsecuredNotesDueMarch152031Member_019eadcc-a687-7c17-afec-00a5749efc6a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019eadcc-a687-7080-9986-ecb7373248f4" 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_019eadcc-a687-7b03-b4a1-5cb33996ba42" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019eadcc-a687-7080-9986-ecb7373248f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eadcc-a687-7080-9986-ecb7373248f4_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_019eadcc-a687-7080-9986-ecb7373248f4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eadcc-a687-7080-9986-ecb7373248f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eadcc-a687-7548-a419-9d634ea57efe" 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_019eadcc-a687-7080-9986-ecb7373248f4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019eadcc-a687-7548-a419-9d634ea57efe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019eadcc-a687-757a-9bb5-4d0baca649f4" 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_019eadcc-a687-7548-a419-9d634ea57efe" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019eadcc-a687-757a-9bb5-4d0baca649f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019eadcc-a687-724b-a19e-c22f105de876" 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_019eadcc-a687-7b03-b4a1-5cb33996ba42" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019eadcc-a687-724b-a19e-c22f105de876" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019eadcc-a687-724b-a19e-c22f105de876_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_019eadcc-a687-724b-a19e-c22f105de876" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019eadcc-a687-724b-a19e-c22f105de876_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019eadcc-a687-7d2e-8c91-2d6402eb544a" 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_019eadcc-a687-724b-a19e-c22f105de876" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019eadcc-a687-7d2e-8c91-2d6402eb544a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019eadcc-a687-767d-b21c-f4c598a70de0" 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_019eadcc-a687-7d2e-8c91-2d6402eb544a" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019eadcc-a687-767d-b21c-f4c598a70de0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019eadcc-a687-72cf-95e8-26bca1aa5304" 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_PortionAtFairValueFairValueDisclosureMember_019eadcc-a687-767d-b21c-f4c598a70de0" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019eadcc-a687-72cf-95e8-26bca1aa5304" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019eadcc-a687-7023-9cb4-19424de149f8" 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_019eadcc-a687-767d-b21c-f4c598a70de0" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019eadcc-a687-7023-9cb4-19424de149f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019eadcc-a687-735f-ac1b-c6ffed73b9a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019eadcc-a687-709f-bfee-9d8acbe73438" xlink:to="loc_us-gaap_LongTermDebtFairValue_019eadcc-a687-735f-ac1b-c6ffed73b9a6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/RelatedPartyDisclosuresScheduleofNetPaymentstoVariousCompaniesDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#RelatedPartyDisclosuresScheduleofNetPaymentstoVariousCompaniesDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/RelatedPartyDisclosuresScheduleofNetPaymentstoVariousCompaniesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019eadcc-a687-7a37-90aa-b20be023a83c" 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_019eadcc-a687-7250-9691-58b267e8db11" 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_019eadcc-a687-7a37-90aa-b20be023a83c" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019eadcc-a687-7250-9691-58b267e8db11" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019eadcc-a687-78ab-a05b-d08a72120687" 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_019eadcc-a687-7250-9691-58b267e8db11" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019eadcc-a687-78ab-a05b-d08a72120687" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-78ab-a05b-d08a72120687_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_019eadcc-a687-78ab-a05b-d08a72120687" xlink:to="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-78ab-a05b-d08a72120687_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-7cd4-b39a-7296c72bc273" 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_019eadcc-a687-78ab-a05b-d08a72120687" xlink:to="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-7cd4-b39a-7296c72bc273" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019eadcc-a687-7a00-8dea-bfc2fd7b281f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-7cd4-b39a-7296c72bc273" xlink:to="loc_us-gaap_RelatedPartyMember_019eadcc-a687-7a00-8dea-bfc2fd7b281f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_019eadcc-a687-73d5-931c-cc58f813b3cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019eadcc-a687-7a37-90aa-b20be023a83c" xlink:to="loc_us-gaap_OperatingLeaseExpense_019eadcc-a687-73d5-931c-cc58f813b3cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LegalFees_019eadcc-a687-770e-9ac8-49f7832714a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LegalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019eadcc-a687-7a37-90aa-b20be023a83c" xlink:to="loc_us-gaap_LegalFees_019eadcc-a687-770e-9ac8-49f7832714a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherGeneralAndAdministrativeExpense_019eadcc-a687-7e99-ad13-e982641c4773" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019eadcc-a687-7a37-90aa-b20be023a83c" xlink:to="loc_us-gaap_OtherGeneralAndAdministrativeExpense_019eadcc-a687-7e99-ad13-e982641c4773" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_019eadcc-a687-7180-9d42-f6560ab35c1f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019eadcc-a687-7a37-90aa-b20be023a83c" xlink:to="loc_us-gaap_CostsAndExpenses_019eadcc-a687-7180-9d42-f6560ab35c1f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019eadcc-a687-79e7-98ab-6783428fb067" 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_019eadcc-a687-76a6-9c9b-29c96d904c5c" 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_019eadcc-a687-79e7-98ab-6783428fb067" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019eadcc-a687-76a6-9c9b-29c96d904c5c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019eadcc-a687-75f9-8e4a-9535e3590453" 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_019eadcc-a687-76a6-9c9b-29c96d904c5c" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019eadcc-a687-75f9-8e4a-9535e3590453" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-75f9-8e4a-9535e3590453_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_019eadcc-a687-75f9-8e4a-9535e3590453" xlink:to="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-75f9-8e4a-9535e3590453_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-7f17-b267-66f429ff1e63" 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_019eadcc-a687-75f9-8e4a-9535e3590453" xlink:to="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-7f17-b267-66f429ff1e63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019eadcc-a687-7be8-b9a0-e263f7dd1d5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-7f17-b267-66f429ff1e63" xlink:to="loc_us-gaap_RelatedPartyMember_019eadcc-a687-7be8-b9a0-e263f7dd1d5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019eadcc-a687-78e0-bf26-b57a495ffb38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019eadcc-a687-7f17-b267-66f429ff1e63" xlink:to="loc_us-gaap_NonrelatedPartyMember_019eadcc-a687-78e0-bf26-b57a495ffb38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019eadcc-a687-7147-a98b-e73f94e3b2da" 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_019eadcc-a687-76a6-9c9b-29c96d904c5c" xlink:to="loc_us-gaap_CreditFacilityAxis_019eadcc-a687-7147-a98b-e73f94e3b2da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019eadcc-a687-7147-a98b-e73f94e3b2da_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_019eadcc-a687-7147-a98b-e73f94e3b2da" xlink:to="loc_us-gaap_CreditFacilityDomain_019eadcc-a687-7147-a98b-e73f94e3b2da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019eadcc-a687-795d-af2a-f43771daa299" 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_019eadcc-a687-7147-a98b-e73f94e3b2da" xlink:to="loc_us-gaap_CreditFacilityDomain_019eadcc-a687-795d-af2a-f43771daa299" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019eadcc-a687-72d7-9cbb-155bf1d9a4fc" 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_019eadcc-a687-795d-af2a-f43771daa299" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019eadcc-a687-72d7-9cbb-155bf1d9a4fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019eadcc-a687-73cd-96af-f5438e77c637" 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_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019eadcc-a687-76a6-9c9b-29c96d904c5c" xlink:to="loc_us-gaap_DebtInstrumentAxis_019eadcc-a687-73cd-96af-f5438e77c637" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-73cd-96af-f5438e77c637_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_019eadcc-a687-73cd-96af-f5438e77c637" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-73cd-96af-f5438e77c637_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-7203-96d0-e31b038c3935" 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_019eadcc-a687-73cd-96af-f5438e77c637" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-7203-96d0-e31b038c3935" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_RevolvingCreditAgreementMember_019eadcc-a687-76e2-8cd3-00a024bc0dc0" xlink:href="uwmc-20260630.xsd#uwmc_RevolvingCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019eadcc-a687-7203-96d0-e31b038c3935" xlink:to="loc_uwmc_RevolvingCreditAgreementMember_019eadcc-a687-76e2-8cd3-00a024bc0dc0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a687-7be4-9f19-5335cc50777a" 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_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019eadcc-a687-76a6-9c9b-29c96d904c5c" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019eadcc-a687-7be4-9f19-5335cc50777a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a687-7be4-9f19-5335cc50777a_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_019eadcc-a687-7be4-9f19-5335cc50777a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a687-7be4-9f19-5335cc50777a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a687-7489-a148-5b5d4c9e9870" 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_019eadcc-a687-7be4-9f19-5335cc50777a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a687-7489-a148-5b5d4c9e9870" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019eadcc-a687-7977-bedd-ce100bf0e449" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019eadcc-a687-7489-a148-5b5d4c9e9870" xlink:to="loc_us-gaap_LineOfCreditMember_019eadcc-a687-7977-bedd-ce100bf0e449" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_019eadcc-a687-76e2-b076-159dceff54ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019eadcc-a687-76a6-9c9b-29c96d904c5c" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_019eadcc-a687-76e2-b076-159dceff54ff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019eadcc-a687-76e2-b076-159dceff54ff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019eadcc-a687-76e2-b076-159dceff54ff" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019eadcc-a687-76e2-b076-159dceff54ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_019eadcc-a687-7f33-9888-9d3af4ba47fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_019eadcc-a687-76e2-b076-159dceff54ff" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_019eadcc-a687-7f33-9888-9d3af4ba47fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SFSCorpMember_019eadcc-a687-7c47-87d4-51add0e7a188" xlink:href="uwmc-20260630.xsd#uwmc_SFSCorpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_019eadcc-a687-7f33-9888-9d3af4ba47fa" xlink:to="loc_uwmc_SFSCorpMember_019eadcc-a687-7c47-87d4-51add0e7a188" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_019eadcc-a687-70bc-9d84-5e777e694700" 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_019eadcc-a687-76a6-9c9b-29c96d904c5c" xlink:to="loc_us-gaap_OtherCommitmentsAxis_019eadcc-a687-70bc-9d84-5e777e694700" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019eadcc-a687-70bc-9d84-5e777e694700_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_019eadcc-a687-70bc-9d84-5e777e694700" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019eadcc-a687-70bc-9d84-5e777e694700_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019eadcc-a687-7af5-831f-10fa4a664df2" 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_019eadcc-a687-70bc-9d84-5e777e694700" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019eadcc-a687-7af5-831f-10fa4a664df2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_NamingRightsAndSponsorshipAgreementMember_019eadcc-a687-7b1c-ba09-5fba55d2336a" xlink:href="uwmc-20260630.xsd#uwmc_NamingRightsAndSponsorshipAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019eadcc-a687-7af5-831f-10fa4a664df2" xlink:to="loc_uwmc_NamingRightsAndSponsorshipAgreementMember_019eadcc-a687-7b1c-ba09-5fba55d2336a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_019eadcc-a687-711c-a269-76565d33e2f4" 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_019eadcc-a687-79e7-98ab-6783428fb067" xlink:to="loc_us-gaap_OtherCommitment_019eadcc-a687-711c-a269-76565d33e2f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_OtherCommitmentsPeriod_019eadcc-a687-764a-9547-a8a1371b51e1" xlink:href="uwmc-20260630.xsd#uwmc_OtherCommitmentsPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019eadcc-a687-79e7-98ab-6783428fb067" xlink:to="loc_uwmc_OtherCommitmentsPeriod_019eadcc-a687-764a-9547-a8a1371b51e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_OtherCommitmentTerminationPeriod_019eadcc-a687-7d9a-bc25-f45230e9ce61" xlink:href="uwmc-20260630.xsd#uwmc_OtherCommitmentTerminationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019eadcc-a687-79e7-98ab-6783428fb067" xlink:to="loc_uwmc_OtherCommitmentTerminationPeriod_019eadcc-a687-7d9a-bc25-f45230e9ce61" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_PaymentsForAircraftRentalFees_019eadcc-a687-725d-8083-68184c9754ec" xlink:href="uwmc-20260630.xsd#uwmc_PaymentsForAircraftRentalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019eadcc-a687-79e7-98ab-6783428fb067" xlink:to="loc_uwmc_PaymentsForAircraftRentalFees_019eadcc-a687-725d-8083-68184c9754ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019eadcc-a687-79a7-a70e-b1a59a316840" 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_019eadcc-a687-79e7-98ab-6783428fb067" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019eadcc-a687-79a7-a70e-b1a59a316840" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019eadcc-a687-78ed-a8e6-297227e3421f" 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_RelatedPartyTransactionLineItems_019eadcc-a687-79e7-98ab-6783428fb067" xlink:to="loc_us-gaap_LongTermDebt_019eadcc-a687-78ed-a8e6-297227e3421f" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/StockBasedCompensationSummaryofRSUActivityDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#StockBasedCompensationSummaryofRSUActivityDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/StockBasedCompensationSummaryofRSUActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-7ff2-9ddd-ebada9ec5b8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019eadcc-a687-7313-a085-ddd3cfb52a80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-7ff2-9ddd-ebada9ec5b8a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019eadcc-a687-7313-a085-ddd3cfb52a80" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7091-8b53-459400e42d4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019eadcc-a687-7313-a085-ddd3cfb52a80" xlink:to="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7091-8b53-459400e42d4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7091-8b53-459400e42d4d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7091-8b53-459400e42d4d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7091-8b53-459400e42d4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7180-939d-015136b1fbb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7091-8b53-459400e42d4d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7180-939d-015136b1fbb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019eadcc-a687-7f2e-accf-ff751387bd8d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7180-939d-015136b1fbb4" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019eadcc-a687-7f2e-accf-ff751387bd8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019eadcc-a687-7e60-9b02-5f7593550137" 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_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019eadcc-a687-7313-a085-ddd3cfb52a80" xlink:to="loc_srt_RangeAxis_019eadcc-a687-7e60-9b02-5f7593550137" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a687-7e60-9b02-5f7593550137_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_019eadcc-a687-7e60-9b02-5f7593550137" xlink:to="loc_srt_RangeMember_019eadcc-a687-7e60-9b02-5f7593550137_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019eadcc-a687-74a5-a454-47a24343ffa3" 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_019eadcc-a687-7e60-9b02-5f7593550137" xlink:to="loc_srt_RangeMember_019eadcc-a687-74a5-a454-47a24343ffa3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019eadcc-a687-743c-acab-10fa3e709a15" 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_019eadcc-a687-74a5-a454-47a24343ffa3" xlink:to="loc_srt_MaximumMember_019eadcc-a687-743c-acab-10fa3e709a15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019eadcc-a687-757d-8fce-530ba31fcf4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-7ff2-9ddd-ebada9ec5b8a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019eadcc-a687-757d-8fce-530ba31fcf4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019eadcc-a687-7735-9809-c89ec0f3ee60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019eadcc-a687-757d-8fce-530ba31fcf4f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019eadcc-a687-7735-9809-c89ec0f3ee60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019eadcc-a687-732b-8466-c058f7c58997" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019eadcc-a687-757d-8fce-530ba31fcf4f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019eadcc-a687-732b-8466-c058f7c58997" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019eadcc-a687-7812-bbe3-3659a63864ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019eadcc-a687-757d-8fce-530ba31fcf4f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019eadcc-a687-7812-bbe3-3659a63864ae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019eadcc-a687-7371-a7f7-2ae6acb711d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_019eadcc-a687-757d-8fce-530ba31fcf4f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019eadcc-a687-7371-a7f7-2ae6acb711d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019eadcc-a687-7322-8bf2-c3b0e5c00418" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019eadcc-a687-7c77-8415-fc8de8cbc2ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-7ff2-9ddd-ebada9ec5b8a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019eadcc-a687-7c77-8415-fc8de8cbc2ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019eadcc-a687-730c-ad26-287033c8710e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019eadcc-a687-7c77-8415-fc8de8cbc2ca" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019eadcc-a687-730c-ad26-287033c8710e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019eadcc-a687-781b-85b6-640fa286afdf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019eadcc-a687-7c77-8415-fc8de8cbc2ca" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019eadcc-a687-781b-85b6-640fa286afdf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019eadcc-a687-7839-b9d3-7f12c6ef1d69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019eadcc-a687-7c77-8415-fc8de8cbc2ca" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019eadcc-a687-7839-b9d3-7f12c6ef1d69" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019eadcc-a687-78d5-937a-74b51ac045d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019eadcc-a687-7c77-8415-fc8de8cbc2ca" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019eadcc-a687-78d5-937a-74b51ac045d4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019eadcc-a687-7b6b-9727-dcebcc7dc489" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019eadcc-a687-7d6f-bb4b-22179e194bfa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-7ff2-9ddd-ebada9ec5b8a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019eadcc-a687-7d6f-bb4b-22179e194bfa" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#StockBasedCompensationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-73b7-a531-d47f811f950e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019eadcc-a687-79f7-bdc0-b0f29a052af9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-73b7-a531-d47f811f950e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019eadcc-a687-79f7-bdc0-b0f29a052af9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7d10-82b5-85da5a4e6b04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019eadcc-a687-79f7-bdc0-b0f29a052af9" xlink:to="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7d10-82b5-85da5a4e6b04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7d10-82b5-85da5a4e6b04_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7d10-82b5-85da5a4e6b04" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-7d10-82b5-85da5a4e6b04_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-793b-a76a-367e2b97b0af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019eadcc-a687-7d10-82b5-85da5a4e6b04" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-793b-a76a-367e2b97b0af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019eadcc-a687-79bf-8434-4be0ced9bca4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019eadcc-a687-793b-a76a-367e2b97b0af" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019eadcc-a687-79bf-8434-4be0ced9bca4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019eadcc-a687-7f03-8c6d-451292cb6853" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-73b7-a531-d47f811f950e" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019eadcc-a687-7f03-8c6d-451292cb6853" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019eadcc-a687-7e7f-9870-e982328a1468" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-73b7-a531-d47f811f950e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019eadcc-a687-7e7f-9870-e982328a1468" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019eadcc-a687-7219-9643-174d3f08bdfa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-73b7-a531-d47f811f950e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019eadcc-a687-7219-9643-174d3f08bdfa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019eadcc-a687-759e-b63b-5ed2db732821" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-73b7-a531-d47f811f950e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019eadcc-a687-759e-b63b-5ed2db732821" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019eadcc-a687-7561-81c6-b4d06ca16d90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019eadcc-a687-73b7-a531-d47f811f950e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019eadcc-a687-7561-81c6-b4d06ca16d90" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/EarningsPerShareAdditionalInformationDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#EarningsPerShareAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/EarningsPerShareAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_019eadcc-a687-73f6-b623-7892e1cd7cc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019eadcc-a687-7cb9-9154-cd97cad6e79e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_019eadcc-a687-73f6-b623-7892e1cd7cc2" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019eadcc-a687-7cb9-9154-cd97cad6e79e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a687-78ee-836e-1b38689eb7c6" 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_ScheduleOfStockByClassTable_019eadcc-a687-7cb9-9154-cd97cad6e79e" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a687-78ee-836e-1b38689eb7c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-78ee-836e-1b38689eb7c6_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_019eadcc-a687-78ee-836e-1b38689eb7c6" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-78ee-836e-1b38689eb7c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-75c7-bca0-35a577820ade" 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_019eadcc-a687-78ee-836e-1b38689eb7c6" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-75c7-bca0-35a577820ade" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019eadcc-a687-7d9a-96dc-a9aee3971dd2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-75c7-bca0-35a577820ade" xlink:to="loc_us-gaap_CommonClassBMember_019eadcc-a687-7d9a-96dc-a9aee3971dd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_NumberOfClassesOfEquity_019eadcc-a687-7f4e-b25a-5c673c982f00" xlink:href="uwmc-20260630.xsd#uwmc_NumberOfClassesOfEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019eadcc-a687-73f6-b623-7892e1cd7cc2" xlink:to="loc_uwmc_NumberOfClassesOfEquity_019eadcc-a687-7f4e-b25a-5c673c982f00" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019eadcc-a687-754a-a8d9-15523d806e3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019eadcc-a687-73f6-b623-7892e1cd7cc2" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019eadcc-a687-754a-a8d9-15523d806e3d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.umw.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="uwmc-20260630.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.umw.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019eadcc-a687-7185-a5ff-ac34cbc3a33b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_us-gaap_SubsequentEventTable_019eadcc-a687-7185-a5ff-ac34cbc3a33b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019eadcc-a687-7fdb-aa71-b4ed47da793c" 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_SubsequentEventTable_019eadcc-a687-7185-a5ff-ac34cbc3a33b" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019eadcc-a687-7fdb-aa71-b4ed47da793c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019eadcc-a687-7fdb-aa71-b4ed47da793c_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_019eadcc-a687-7fdb-aa71-b4ed47da793c" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019eadcc-a687-7fdb-aa71-b4ed47da793c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019eadcc-a687-73b8-ad14-895f52736c81" 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_019eadcc-a687-7fdb-aa71-b4ed47da793c" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019eadcc-a687-73b8-ad14-895f52736c81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019eadcc-a687-73f8-aba6-2b2ef3d26f2a" 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_019eadcc-a687-73b8-ad14-895f52736c81" xlink:to="loc_us-gaap_SubsequentEventMember_019eadcc-a687-73f8-aba6-2b2ef3d26f2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a687-74da-846f-d305738a661d" 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_SubsequentEventTable_019eadcc-a687-7185-a5ff-ac34cbc3a33b" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019eadcc-a687-74da-846f-d305738a661d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-74da-846f-d305738a661d_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_019eadcc-a687-74da-846f-d305738a661d" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-74da-846f-d305738a661d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7c3c-8112-19555db3c07d" 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_019eadcc-a687-74da-846f-d305738a661d" xlink:to="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7c3c-8112-19555db3c07d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeriesA1PreferredStockMember_019fd2d9-2033-7927-b31e-7226ea505668" xlink:href="uwmc-20260630.xsd#uwmc_SeriesA1PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7c3c-8112-19555db3c07d" xlink:to="loc_uwmc_SeriesA1PreferredStockMember_019fd2d9-2033-7927-b31e-7226ea505668" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_SeriesA2PreferredStockMember_019fd2d9-2033-7375-923f-f1b34cdf03c5" xlink:href="uwmc-20260630.xsd#uwmc_SeriesA2PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7c3c-8112-19555db3c07d" xlink:to="loc_uwmc_SeriesA2PreferredStockMember_019fd2d9-2033-7375-923f-f1b34cdf03c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_019fd2d9-2033-7f8b-891c-d7e1adfe4334" 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_019eadcc-a687-7c3c-8112-19555db3c07d" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_019fd2d9-2033-7f8b-891c-d7e1adfe4334" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019eadcc-a687-714f-9e86-4c4aaf69303d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019eadcc-a687-7c3c-8112-19555db3c07d" xlink:to="loc_us-gaap_CommonClassAMember_019eadcc-a687-714f-9e86-4c4aaf69303d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019fd2d9-2033-7a5a-b21a-efd6135546fd" 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_SubsequentEventTable_019eadcc-a687-7185-a5ff-ac34cbc3a33b" xlink:to="loc_srt_RangeAxis_019fd2d9-2033-7a5a-b21a-efd6135546fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019fd2d9-2033-7a5a-b21a-efd6135546fd_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_019fd2d9-2033-7a5a-b21a-efd6135546fd" xlink:to="loc_srt_RangeMember_019fd2d9-2033-7a5a-b21a-efd6135546fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019fd2d9-2033-7a8e-b07f-0464a72f245f" 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_019fd2d9-2033-7a5a-b21a-efd6135546fd" xlink:to="loc_srt_RangeMember_019fd2d9-2033-7a8e-b07f-0464a72f245f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019fd2d9-2033-74d7-a20f-692da8812bce" 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_019fd2d9-2033-7a8e-b07f-0464a72f245f" xlink:to="loc_srt_MinimumMember_019fd2d9-2033-74d7-a20f-692da8812bce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019fd2d9-2033-7cdc-90bd-8e8108086907" 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_019fd2d9-2033-7a8e-b07f-0464a72f245f" xlink:to="loc_srt_MaximumMember_019fd2d9-2033-7cdc-90bd-8e8108086907" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019fd2d9-2033-75f4-a113-60417ab2df05" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019eadcc-a687-7185-a5ff-ac34cbc3a33b" xlink:to="loc_srt_StatementScenarioAxis_019fd2d9-2033-75f4-a113-60417ab2df05" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019fd2d9-2033-75f4-a113-60417ab2df05_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019fd2d9-2033-75f4-a113-60417ab2df05" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019fd2d9-2033-75f4-a113-60417ab2df05_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019fd2d9-2033-7fa5-8942-3526450fc569" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019fd2d9-2033-75f4-a113-60417ab2df05" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019fd2d9-2033-7fa5-8942-3526450fc569" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019fd2d9-2033-7945-aaff-64b42f82d982" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019fd2d9-2033-7fa5-8942-3526450fc569" xlink:to="loc_srt_ScenarioForecastMember_019fd2d9-2033-7945-aaff-64b42f82d982" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019fd4a1-010c-71d1-94ef-f59e9989ac31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019eadcc-a687-7185-a5ff-ac34cbc3a33b" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019fd4a1-010c-71d1-94ef-f59e9989ac31" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019fd4a1-010c-71d1-94ef-f59e9989ac31_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019fd4a1-010c-71d1-94ef-f59e9989ac31" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019fd4a1-010c-71d1-94ef-f59e9989ac31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019fd4a1-010c-737a-aea5-746cd4699de0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019fd4a1-010c-71d1-94ef-f59e9989ac31" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019fd4a1-010c-737a-aea5-746cd4699de0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivatePlacementMember_019fd4a2-3aed-7369-b552-ab7be31049d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019fd4a1-010c-737a-aea5-746cd4699de0" xlink:to="loc_us-gaap_PrivatePlacementMember_019fd4a2-3aed-7369-b552-ab7be31049d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_019fd4e3-6ed6-7b8b-8513-a65befe84eca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019eadcc-a687-7185-a5ff-ac34cbc3a33b" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_019fd4e3-6ed6-7b8b-8513-a65befe84eca" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019fd4e3-6ed6-7b8b-8513-a65befe84eca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019fd4e3-6ed6-7b8b-8513-a65befe84eca" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019fd4e3-6ed6-7b8b-8513-a65befe84eca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019fd4e3-6ed6-7ab0-8ad1-cbd204430b63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019fd4e3-6ed6-7b8b-8513-a65befe84eca" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019fd4e3-6ed6-7ab0-8ad1-cbd204430b63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ClassACommonStockWarrantsAt2.00Member_019fd4e6-2963-707b-99e6-38561887a7cf" xlink:href="uwmc-20260630.xsd#uwmc_ClassACommonStockWarrantsAt2.00Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019fd4e3-6ed6-7ab0-8ad1-cbd204430b63" xlink:to="loc_uwmc_ClassACommonStockWarrantsAt2.00Member_019fd4e6-2963-707b-99e6-38561887a7cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_ClassACommonStockWarrantsAt6.00Member_019fd4e6-8ba0-7836-bc90-5fe5962e10e3" xlink:href="uwmc-20260630.xsd#uwmc_ClassACommonStockWarrantsAt6.00Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019fd4e3-6ed6-7ab0-8ad1-cbd204430b63" xlink:to="loc_uwmc_ClassACommonStockWarrantsAt6.00Member_019fd4e6-8ba0-7836-bc90-5fe5962e10e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019fd2d9-2033-7249-a8dd-db04edfbfc75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019fd2d9-2033-7249-a8dd-db04edfbfc75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019fd2d9-2033-7fc4-8225-8399b5ca9da7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019fd2d9-2033-7fc4-8225-8399b5ca9da7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_019fd457-47cf-7d30-82af-a38a9d5a87c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_019fd457-47cf-7d30-82af-a38a9d5a87c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019fd457-47cf-7a07-8fd7-3e1ca19552aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019fd457-47cf-7a07-8fd7-3e1ca19552aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_PreferredStockOriginalIssuePrice_019fd471-a801-71b0-84cb-a7b388c79d03" xlink:href="uwmc-20260630.xsd#uwmc_PreferredStockOriginalIssuePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_uwmc_PreferredStockOriginalIssuePrice_019fd471-a801-71b0-84cb-a7b388c79d03" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_019fd2d9-2033-7d04-a396-0b06364e4389" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_019fd2d9-2033-7d04-a396-0b06364e4389" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_StockOfferingProgramAuthorizedAmount_019fd468-d570-755d-8aac-f10096e1f499" xlink:href="uwmc-20260630.xsd#uwmc_StockOfferingProgramAuthorizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_uwmc_StockOfferingProgramAuthorizedAmount_019fd468-d570-755d-8aac-f10096e1f499" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_StockOfferingProgramAuthorizedNumberOfShares_019fd461-efbe-7b82-b91c-ea86dc947a26" xlink:href="uwmc-20260630.xsd#uwmc_StockOfferingProgramAuthorizedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_uwmc_StockOfferingProgramAuthorizedNumberOfShares_019fd461-efbe-7b82-b91c-ea86dc947a26" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_StockOfferingProgramSharesAuthorizedPricePerShare_019fddaf-905d-76f1-bd1b-cb16cebf467f" xlink:href="uwmc-20260630.xsd#uwmc_StockOfferingProgramSharesAuthorizedPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_uwmc_StockOfferingProgramSharesAuthorizedPricePerShare_019fddaf-905d-76f1-bd1b-cb16cebf467f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_StockOfferingProgramSharesAuthorizedPricePerSharePercentage_019fddb8-b365-76d2-9586-de8027c17d47" xlink:href="uwmc-20260630.xsd#uwmc_StockOfferingProgramSharesAuthorizedPricePerSharePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019eadcc-a687-788e-83a6-58a343c8d626" xlink:to="loc_uwmc_StockOfferingProgramSharesAuthorizedPricePerSharePercentage_019fddb8-b365-76d2-9586-de8027c17d47" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_uwmc_MatIshbiaMember_019eadcc-a3a4-7081-ad9c-86aaf872ff7a" xlink:href="uwmc-20260630.xsd#uwmc_MatIshbiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_uwmc_MatIshbiaMember_019eadcc-a3a4-7081-ad9c-86aaf872ff7a" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
