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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019d7251-5498-7608-b501-e596ac627f03,g:6d24c96c-08f1-467d-b141-42c5db88e43f-->
<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.thirdfederal.com/role/DocumentandEntityInformation" xlink:type="simple" xlink:href="tfsl-20260625.xsd#DocumentandEntityInformation"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/DocumentandEntityInformation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019e45b6-115f-7cb9-9502-b829aa3b4755" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019e45b6-115f-79fb-9fc2-d747c45d82ad" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019e45b6-115f-7cb9-9502-b829aa3b4755" xlink:to="loc_dei_DocumentInformationTable_019e45b6-115f-79fb-9fc2-d747c45d82ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45e9-36e6-75b8-9f13-717f79612299" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019e45b6-115f-79fb-9fc2-d747c45d82ad" xlink:to="loc_dei_LegalEntityAxis_019e45e9-36e6-75b8-9f13-717f79612299" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e9-36e6-75b8-9f13-717f79612299_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45e9-36e6-75b8-9f13-717f79612299" xlink:to="loc_dei_EntityDomain_019e45e9-36e6-75b8-9f13-717f79612299_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e9-36e6-7ea4-b948-dc6dd339c3b3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45e9-36e6-75b8-9f13-717f79612299" xlink:to="loc_dei_EntityDomain_019e45e9-36e6-7ea4-b948-dc6dd339c3b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45e9-4b5b-78bb-95e1-5173d48e2e45" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45e9-36e6-7ea4-b948-dc6dd339c3b3" xlink:to="loc_tfsl_EBP340573493002Member_019e45e9-4b5b-78bb-95e1-5173d48e2e45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e45b6-115f-7b9a-bfbb-7c7613bc3229" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e45b6-115f-7cb9-9502-b829aa3b4755" xlink:to="loc_dei_EntityRegistrantName_019e45b6-115f-7b9a-bfbb-7c7613bc3229" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e45bb-63cd-74fe-bcc1-9d681f728818" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e45b6-115f-7cb9-9502-b829aa3b4755" xlink:to="loc_dei_DocumentType_019e45bb-63cd-74fe-bcc1-9d681f728818" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e45bc-7c19-73e8-ad0f-51103da824ee" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e45b6-115f-7cb9-9502-b829aa3b4755" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e45bc-7c19-73e8-ad0f-51103da824ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e45e9-e620-76be-a52d-8840324fdc9d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e45b6-115f-7cb9-9502-b829aa3b4755" xlink:to="loc_dei_EntityCentralIndexKey_019e45e9-e620-76be-a52d-8840324fdc9d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e45ea-2333-7794-bd56-af7cb72aee56" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e45b6-115f-7cb9-9502-b829aa3b4755" xlink:to="loc_dei_AmendmentFlag_019e45ea-2333-7794-bd56-af7cb72aee56" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanStatementofNetAssetAvailableforBenefitStatement" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanStatementofNetAssetAvailableforBenefitStatement"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanStatementofNetAssetAvailableforBenefitStatement" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019df8a1-3cfd-71fb-8f03-d07116fee26f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019df8a1-3cfd-71fb-8f03-d07116fee26f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019df8a1-3cfd-79be-8cc4-4beace2b28ed" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019df8a1-3cfd-71fb-8f03-d07116fee26f" xlink:to="loc_dei_LegalEntityAxis_019df8a1-3cfd-79be-8cc4-4beace2b28ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019df8a1-3cfd-79be-8cc4-4beace2b28ed_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019df8a1-3cfd-79be-8cc4-4beace2b28ed" xlink:to="loc_dei_EntityDomain_019df8a1-3cfd-79be-8cc4-4beace2b28ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019df8a1-3cfd-759f-917f-8947d536ca1d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019df8a1-3cfd-79be-8cc4-4beace2b28ed" xlink:to="loc_dei_EntityDomain_019df8a1-3cfd-759f-917f-8947d536ca1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019df903-cf98-7e71-b92a-24e43fe82237" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019df8a1-3cfd-759f-917f-8947d536ca1d" xlink:to="loc_tfsl_EBP340573493002Member_019df903-cf98-7e71-b92a-24e43fe82237" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019df8a1-3cfd-7b0e-8110-7106d7fb4387" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019df8a1-3cfd-71fb-8f03-d07116fee26f" xlink:to="loc_us-gaap_InvestmentTypeAxis_019df8a1-3cfd-7b0e-8110-7106d7fb4387" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019df8a1-3cfd-7b0e-8110-7106d7fb4387_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019df8a1-3cfd-7b0e-8110-7106d7fb4387" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019df8a1-3cfd-7b0e-8110-7106d7fb4387_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019df8a1-3cfd-7a3f-bc2c-43d2f0ebf1a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019df8a1-3cfd-7b0e-8110-7106d7fb4387" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019df8a1-3cfd-7a3f-bc2c-43d2f0ebf1a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusAxis_019df8a1-3cfd-7df0-ac65-bcd655d9295e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAllocationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019df8a1-3cfd-71fb-8f03-d07116fee26f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusAxis_019df8a1-3cfd-7df0-ac65-bcd655d9295e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain_019df8a1-3cfd-7df0-ac65-bcd655d9295e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusAxis_019df8a1-3cfd-7df0-ac65-bcd655d9295e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain_019df8a1-3cfd-7df0-ac65-bcd655d9295e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain_019df8a1-3cfd-7b9c-8bb9-484cb81692b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusAxis_019df8a1-3cfd-7df0-ac65-bcd655d9295e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain_019df8a1-3cfd-7b9c-8bb9-484cb81692b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusAxis_019df8a1-3cfd-7339-b30e-a56fc9c7f0b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019df8a1-3cfd-71fb-8f03-d07116fee26f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusAxis_019df8a1-3cfd-7339-b30e-a56fc9c7f0b3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain_019df8a1-3cfd-7339-b30e-a56fc9c7f0b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusAxis_019df8a1-3cfd-7339-b30e-a56fc9c7f0b3" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain_019df8a1-3cfd-7339-b30e-a56fc9c7f0b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain_019df8a1-3cfd-7956-8603-9a10f1c20d9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusAxis_019df8a1-3cfd-7339-b30e-a56fc9c7f0b3" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain_019df8a1-3cfd-7956-8603-9a10f1c20d9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestAxis_019df8a1-3cfd-7b78-84a3-53f00c7f9d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019df8a1-3cfd-71fb-8f03-d07116fee26f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestAxis_019df8a1-3cfd-7b78-84a3-53f00c7f9d8e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain_019df8a1-3cfd-7b78-84a3-53f00c7f9d8e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestAxis_019df8a1-3cfd-7b78-84a3-53f00c7f9d8e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain_019df8a1-3cfd-7b78-84a3-53f00c7f9d8e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain_019df8a1-3cfd-756f-8e49-38286b91a976" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestAxis_019df8a1-3cfd-7b78-84a3-53f00c7f9d8e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestDomain_019df8a1-3cfd-756f-8e49-38286b91a976" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019df8a1-3cfd-75a7-b290-8056ae34ec02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019df8a1-3cfd-75a7-b290-8056ae34ec02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable_019df8a3-741b-7ae3-ae7c-91df5ff3e097" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable_019df8a3-741b-7ae3-ae7c-91df5ff3e097" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant_019df8a3-e635-7403-87e9-6fc060858fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant_019df8a3-e635-7403-87e9-6fc060858fe1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReceivable_019df8a4-3bb5-7e73-9f06-0e3096597dca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReceivable_019df8a4-3bb5-7e73-9f06-0e3096597dca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAsset_019df8a4-85b9-7578-95c7-168939512629" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAsset_019df8a4-85b9-7578-95c7-168939512629" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanLiability_019df8d0-6d16-7859-abdf-ae599258fc5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanLiability_019df8d0-6d16-7859-abdf-ae599258fc5d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019df8a5-74ba-726a-80c1-401d5cf861a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019df8a5-74ba-726a-80c1-401d5cf861a8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019df8a7-b74f-76cc-a9ca-6b30ae0d8a5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019df8a7-b74f-76cc-a9ca-6b30ae0d8a5d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover_019df8a8-e85e-77c2-8f9f-afcd683004e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover_019df8a8-e85e-77c2-8f9f-afcd683004e1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover_019df8a9-8d5a-7e0d-8132-5f718f5d6377" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover_019df8a9-8d5a-7e0d-8132-5f718f5d6377" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution_019df8aa-b303-758f-95cc-f3a7084edff9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution_019df8aa-b303-758f-95cc-f3a7084edff9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment_019df8d4-18d5-7b64-8ae4-2e19103771af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment_019df8d4-18d5-7b64-8ae4-2e19103771af" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment_019df8d4-aa42-7cf6-9bce-9dd6c6e0f962" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment_019df8d4-aa42-7cf6-9bce-9dd6c6e0f962" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019df8bc-8c38-721f-a396-0128482c7950" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019df8bc-8c38-721f-a396-0128482c7950" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment_019df8bd-86ef-7d7c-b58c-22909ab78c5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment_019df8bd-86ef-7d7c-b58c-22909ab78c5b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease_019df8d2-acbf-7ecd-81e7-483abd9c741d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease_019df8d2-acbf-7ecd-81e7-483abd9c741d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant_019df8be-3fcc-79e6-9215-80bc89b8a34a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant_019df8be-3fcc-79e6-9215-80bc89b8a34a" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense_019df8be-b49e-7cde-a6eb-87713fd3c74b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense_019df8be-b49e-7cde-a6eb-87713fd3c74b" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease_019df8bf-1f2f-78e2-baca-54a725cb504b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease_019df8bf-1f2f-78e2-baca-54a725cb504b" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease_019df8bf-93b0-78ec-9265-0ef0618aafc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease_019df8bf-93b0-78ec-9265-0ef0618aafc7" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitTransferToFromExternalPlan_019df8c0-3fa9-7b10-a78d-3c268f8ac241" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitTransferToFromExternalPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019df8a1-3cfd-746d-8e4d-c36417f7ca8d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitTransferToFromExternalPlan_019df8c0-3fa9-7b10-a78d-3c268f8ac241" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanStatementofChangeinNetAssetAvailableforBenefitStatement" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanStatementofChangeinNetAssetAvailableforBenefitStatement"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanStatementofChangeinNetAssetAvailableforBenefitStatement" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019dfd5c-4ce8-75be-bf4d-b1dc8e51aee2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019dfd5c-4ce8-75be-bf4d-b1dc8e51aee2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019dfd5c-4ce8-76dc-83a7-7a666e0b5690" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019dfd5c-4ce8-75be-bf4d-b1dc8e51aee2" xlink:to="loc_us-gaap_InvestmentTypeAxis_019dfd5c-4ce8-76dc-83a7-7a666e0b5690" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019dfd5c-4ce8-76dc-83a7-7a666e0b5690_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019dfd5c-4ce8-76dc-83a7-7a666e0b5690" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019dfd5c-4ce8-76dc-83a7-7a666e0b5690_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019dfd5c-4ce8-709c-9dd7-59902e804db8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019dfd5c-4ce8-76dc-83a7-7a666e0b5690" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019dfd5c-4ce8-709c-9dd7-59902e804db8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusAxis_019dfd5c-4ce8-7267-9d7b-25729ec78ea2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAllocationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019dfd5c-4ce8-75be-bf4d-b1dc8e51aee2" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusAxis_019dfd5c-4ce8-7267-9d7b-25729ec78ea2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain_019dfd5c-4ce8-7267-9d7b-25729ec78ea2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusAxis_019dfd5c-4ce8-7267-9d7b-25729ec78ea2" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain_019dfd5c-4ce8-7267-9d7b-25729ec78ea2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain_019dfd5c-4ce8-7ad1-aaf3-61dd2272daa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusAxis_019dfd5c-4ce8-7267-9d7b-25729ec78ea2" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAllocationStatusDomain_019dfd5c-4ce8-7ad1-aaf3-61dd2272daa7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusAxis_019dfd5c-4ce8-7a37-af40-124260508ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019dfd5c-4ce8-75be-bf4d-b1dc8e51aee2" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusAxis_019dfd5c-4ce8-7a37-af40-124260508ad0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain_019dfd5c-4ce8-7a37-af40-124260508ad0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusAxis_019dfd5c-4ce8-7a37-af40-124260508ad0" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain_019dfd5c-4ce8-7a37-af40-124260508ad0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain_019dfd5c-4ce8-74b8-b4fc-aea4113406c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusAxis_019dfd5c-4ce8-7a37-af40-124260508ad0" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantDirectedStatusDomain_019dfd5c-4ce8-74b8-b4fc-aea4113406c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019dfd62-6703-7bbd-b9f4-1845445425ee" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019dfd5c-4ce8-75be-bf4d-b1dc8e51aee2" xlink:to="loc_dei_LegalEntityAxis_019dfd62-6703-7bbd-b9f4-1845445425ee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019dfd62-6703-7bbd-b9f4-1845445425ee_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019dfd62-6703-7bbd-b9f4-1845445425ee" xlink:to="loc_dei_EntityDomain_019dfd62-6703-7bbd-b9f4-1845445425ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019dfd62-6703-720a-a397-13ab7fa5f28d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019dfd62-6703-7bbd-b9f4-1845445425ee" xlink:to="loc_dei_EntityDomain_019dfd62-6703-720a-a397-13ab7fa5f28d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019dfd62-7b00-7036-8692-68dc3e6c9a65" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019dfd62-6703-720a-a397-13ab7fa5f28d" xlink:to="loc_tfsl_EBP340573493002Member_019dfd62-7b00-7036-8692-68dc3e6c9a65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019dfd61-ac5c-7480-a4e1-5ed5fb342d78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019dfd61-ac5c-7480-a4e1-5ed5fb342d78" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover_019dfd63-30c0-78d8-be6f-2c2859d78707" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionExcludingRollover_019dfd63-30c0-78d8-be6f-2c2859d78707" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover_019dfd63-ff92-7750-bc7b-f1e72da6d1ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover_019dfd63-ff92-7750-bc7b-f1e72da6d1ad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution_019dfd64-c192-7c8c-8bb0-2c3d3b7dd397" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution_019dfd64-c192-7c8c-8bb0-2c3d3b7dd397" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment_019dfd66-8374-78b7-8c53-9e19a6713680" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnInvestment_019dfd66-8374-78b7-8c53-9e19a6713680" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment_019dfd67-0b73-7653-8866-2863765acaa0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment_019dfd67-0b73-7653-8866-2863765acaa0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019dfd68-0489-78ed-873f-33cbe37ac7d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019dfd68-0489-78ed-873f-33cbe37ac7d3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment_019dfd68-f1d1-7416-9715-e902be876a68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment_019dfd68-f1d1-7416-9715-e902be876a68" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease_019dfd65-7611-73e5-9d2c-57460a2c6b87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease_019dfd65-7611-73e5-9d2c-57460a2c6b87" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant_019dfd6f-57bc-7800-b1fd-36fe8336c456" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant_019dfd6f-57bc-7800-b1fd-36fe8336c456" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense_019dfd6f-e329-7310-a227-99731384bb0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense_019dfd6f-e329-7310-a227-99731384bb0a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease_019dfd70-717a-70b4-9462-fe9bf71959e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease_019dfd70-717a-70b4-9462-fe9bf71959e2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease_019dfd71-a01c-7fff-a8f5-b65a9119a2a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease_019dfd71-a01c-7fff-a8f5-b65a9119a2a7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitTransferToFromExternalPlan_019dfd73-3b08-7481-8efc-c2209a573707" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitTransferToFromExternalPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitTransferToFromExternalPlan_019dfd73-3b08-7481-8efc-c2209a573707" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019dfd74-9c5e-7f83-8b6a-34be76592d7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019dfd5c-4ce8-76c8-a2fe-e1154de7b31f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019dfd74-9c5e-7f83-8b6a-34be76592d7a" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanDescriptionofPlan" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanDescriptionofPlan"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanDescriptionofPlan" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45e6-ef0a-7ac3-b5cb-02aff5078ad4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e45e6-ef0a-7cf3-8b2d-280c63facbc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45e6-ef0a-7ac3-b5cb-02aff5078ad4" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e45e6-ef0a-7cf3-8b2d-280c63facbc0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45e6-ef0a-7c85-917e-cd68a59814ca" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e45e6-ef0a-7cf3-8b2d-280c63facbc0" xlink:to="loc_dei_LegalEntityAxis_019e45e6-ef0a-7c85-917e-cd68a59814ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e6-ef0a-7c85-917e-cd68a59814ca_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45e6-ef0a-7c85-917e-cd68a59814ca" xlink:to="loc_dei_EntityDomain_019e45e6-ef0a-7c85-917e-cd68a59814ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e6-ef0a-7c26-b05c-05272a23e31e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45e6-ef0a-7c85-917e-cd68a59814ca" xlink:to="loc_dei_EntityDomain_019e45e6-ef0a-7c26-b05c-05272a23e31e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45e6-ef0a-7fd4-a33e-a6630d1a9d75" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45e6-ef0a-7c26-b05c-05272a23e31e" xlink:to="loc_tfsl_EBP340573493002Member_019e45e6-ef0a-7fd4-a33e-a6630d1a9d75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock_019e45e6-ef0a-7234-8560-af2f55784247" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45e6-ef0a-7ac3-b5cb-02aff5078ad4" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock_019e45e6-ef0a-7234-8560-af2f55784247" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanSummaryofAccountingPolicy" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanSummaryofAccountingPolicy"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanSummaryofAccountingPolicy" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e45e6-d694-7b9a-88ac-900061b31d73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e45e6-d694-7017-b827-80f16101421e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e45e6-d694-7b9a-88ac-900061b31d73" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e45e6-d694-7017-b827-80f16101421e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45e6-d694-7423-87e7-56497fed7e81" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e45e6-d694-7017-b827-80f16101421e" xlink:to="loc_dei_LegalEntityAxis_019e45e6-d694-7423-87e7-56497fed7e81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e6-d694-7423-87e7-56497fed7e81_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45e6-d694-7423-87e7-56497fed7e81" xlink:to="loc_dei_EntityDomain_019e45e6-d694-7423-87e7-56497fed7e81_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e6-d694-712d-9779-86d507d1ec5b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45e6-d694-7423-87e7-56497fed7e81" xlink:to="loc_dei_EntityDomain_019e45e6-d694-712d-9779-86d507d1ec5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45e6-d694-7222-8e0c-2aca76800bc4" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45e6-d694-712d-9779-86d507d1ec5b" xlink:to="loc_tfsl_EBP340573493002Member_019e45e6-d694-7222-8e0c-2aca76800bc4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock_019e45e6-d694-78d1-acf3-3b7d280832d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e45e6-d694-7b9a-88ac-900061b31d73" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock_019e45e6-d694-78d1-acf3-3b7d280832d5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanFairValueandNAV" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanFairValueandNAV"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanFairValueandNAV" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e4a9a-22f4-7901-b486-5d116920c4ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e4a9a-22f4-7166-b9e4-40916768ffbe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e4a9a-22f4-7901-b486-5d116920c4ee" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e4a9a-22f4-7166-b9e4-40916768ffbe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4a9a-22f4-76d3-aeb9-f1008345cad5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e4a9a-22f4-7166-b9e4-40916768ffbe" xlink:to="loc_dei_LegalEntityAxis_019e4a9a-22f4-76d3-aeb9-f1008345cad5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4a9a-22f4-76d3-aeb9-f1008345cad5_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4a9a-22f4-76d3-aeb9-f1008345cad5" xlink:to="loc_dei_EntityDomain_019e4a9a-22f4-76d3-aeb9-f1008345cad5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4a9a-22f4-7b53-a972-cfc2972ef612" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4a9a-22f4-76d3-aeb9-f1008345cad5" xlink:to="loc_dei_EntityDomain_019e4a9a-22f4-7b53-a972-cfc2972ef612" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e4a9a-22f4-726d-a2a9-06e88f93f5d5" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4a9a-22f4-7b53-a972-cfc2972ef612" xlink:to="loc_tfsl_EBP340573493002Member_019e4a9a-22f4-726d-a2a9-06e88f93f5d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock_019e4a9a-22f4-70d2-a005-5d25fb7aee73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e4a9a-22f4-7901-b486-5d116920c4ee" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock_019e4a9a-22f4-70d2-a005-5d25fb7aee73" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanNonparticipantDirectedInvestment" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanNonparticipantDirectedInvestment"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanNonparticipantDirectedInvestment" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentLineItems_019e45e6-6ed3-7492-85c1-4e19aa13957a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTable_019e45e6-6ed3-7610-80c1-edd1b1e80c2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentLineItems_019e45e6-6ed3-7492-85c1-4e19aa13957a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTable_019e45e6-6ed3-7610-80c1-edd1b1e80c2f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45e6-6ed3-75b5-8e3f-9dd25445ae91" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTable_019e45e6-6ed3-7610-80c1-edd1b1e80c2f" xlink:to="loc_dei_LegalEntityAxis_019e45e6-6ed3-75b5-8e3f-9dd25445ae91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e6-6ed3-75b5-8e3f-9dd25445ae91_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45e6-6ed3-75b5-8e3f-9dd25445ae91" xlink:to="loc_dei_EntityDomain_019e45e6-6ed3-75b5-8e3f-9dd25445ae91_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e6-6ed3-7bc3-91df-9ca2add10ee1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45e6-6ed3-75b5-8e3f-9dd25445ae91" xlink:to="loc_dei_EntityDomain_019e45e6-6ed3-7bc3-91df-9ca2add10ee1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45e6-6ed3-7a46-9af2-a04455303a9a" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45e6-6ed3-7bc3-91df-9ca2add10ee1" xlink:to="loc_tfsl_EBP340573493002Member_019e45e6-6ed3-7a46-9af2-a04455303a9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTextBlock_019e45e6-6ed3-79eb-bbc3-51adeb81f4b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentLineItems_019e45e6-6ed3-7492-85c1-4e19aa13957a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTextBlock_019e45e6-6ed3-79eb-bbc3-51adeb81f4b7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanTaxStatus" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanTaxStatus"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanTaxStatus" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e45e6-513d-7397-8693-146080a38f71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e45e6-513d-7919-a458-19d0ab1c7584" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e45e6-513d-7397-8693-146080a38f71" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e45e6-513d-7919-a458-19d0ab1c7584" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45e6-513d-759d-959d-afd7ef34d0f2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e45e6-513d-7919-a458-19d0ab1c7584" xlink:to="loc_dei_LegalEntityAxis_019e45e6-513d-759d-959d-afd7ef34d0f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e6-513d-759d-959d-afd7ef34d0f2_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45e6-513d-759d-959d-afd7ef34d0f2" xlink:to="loc_dei_EntityDomain_019e45e6-513d-759d-959d-afd7ef34d0f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e6-513d-77c0-8041-1cdaa66f25ea" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45e6-513d-759d-959d-afd7ef34d0f2" xlink:to="loc_dei_EntityDomain_019e45e6-513d-77c0-8041-1cdaa66f25ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45e6-513d-740c-8461-9efa673246d4" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45e6-513d-77c0-8041-1cdaa66f25ea" xlink:to="loc_tfsl_EBP340573493002Member_019e45e6-513d-740c-8461-9efa673246d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock_019e45e6-513d-7c06-a39e-3d541849dfc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e45e6-513d-7397-8693-146080a38f71" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock_019e45e6-513d-7c06-a39e-3d541849dfc1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanRelatedPartyandPartyinInterestTransactions" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanRelatedPartyandPartyinInterestTransactions"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanRelatedPartyandPartyinInterestTransactions" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e45e6-1721-77bf-80a5-fc7212a746ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e45e6-1721-728a-b359-8eb7796c7758" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e45e6-1721-77bf-80a5-fc7212a746ad" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e45e6-1721-728a-b359-8eb7796c7758" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45e6-1721-702b-a0ed-fa85a983f303" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e45e6-1721-728a-b359-8eb7796c7758" xlink:to="loc_dei_LegalEntityAxis_019e45e6-1721-702b-a0ed-fa85a983f303" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e6-1721-702b-a0ed-fa85a983f303_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45e6-1721-702b-a0ed-fa85a983f303" xlink:to="loc_dei_EntityDomain_019e45e6-1721-702b-a0ed-fa85a983f303_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e6-1721-7dbc-a58a-39ccd3606379" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45e6-1721-702b-a0ed-fa85a983f303" xlink:to="loc_dei_EntityDomain_019e45e6-1721-7dbc-a58a-39ccd3606379" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45e6-1721-75b7-875a-c5c275681733" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45e6-1721-7dbc-a58a-39ccd3606379" xlink:to="loc_tfsl_EBP340573493002Member_019e45e6-1721-75b7-875a-c5c275681733" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock_019e45e6-1721-7230-8819-249d5472864c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e45e6-1721-77bf-80a5-fc7212a746ad" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock_019e45e6-1721-7230-8819-249d5472864c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanSubsequentEvent" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanSubsequentEvent"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanSubsequentEvent" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpSubsequentEventLineItems_019e45e5-8e4e-78da-a952-1e2b09a7258d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EbpSubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpSubsequentEventTable_019e45e5-8e4e-7a8e-8955-67cb5ac60c7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EbpSubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EbpSubsequentEventLineItems_019e45e5-8e4e-78da-a952-1e2b09a7258d" xlink:to="loc_us-gaap-ebp_EbpSubsequentEventTable_019e45e5-8e4e-7a8e-8955-67cb5ac60c7a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45e5-8e4e-7459-99b0-bbd1f60355b3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EbpSubsequentEventTable_019e45e5-8e4e-7a8e-8955-67cb5ac60c7a" xlink:to="loc_dei_LegalEntityAxis_019e45e5-8e4e-7459-99b0-bbd1f60355b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e5-8e4e-7459-99b0-bbd1f60355b3_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45e5-8e4e-7459-99b0-bbd1f60355b3" xlink:to="loc_dei_EntityDomain_019e45e5-8e4e-7459-99b0-bbd1f60355b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e5-8e4e-71e5-9c05-b1e6661f814e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45e5-8e4e-7459-99b0-bbd1f60355b3" xlink:to="loc_dei_EntityDomain_019e45e5-8e4e-71e5-9c05-b1e6661f814e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45e5-8e4e-7da6-8c49-c64d3675a18f" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45e5-8e4e-71e5-9c05-b1e6661f814e" xlink:to="loc_tfsl_EBP340573493002Member_019e45e5-8e4e-7da6-8c49-c64d3675a18f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventTextBlock_019e45e5-8e4e-731c-9560-1d644bdfb031" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanSubsequentEventTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EbpSubsequentEventLineItems_019e45e5-8e4e-78da-a952-1e2b09a7258d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventTextBlock_019e45e5-8e4e-731c-9560-1d644bdfb031" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanSummaryofAccountingPolicyPolicies" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanSummaryofAccountingPolicyPolicies"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanSummaryofAccountingPolicyPolicies" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpAccountingStandardUpdateAndChangeInAccountingPrincipleLineItems_019e45e5-3899-739f-9bc2-5a4829a2aab9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EbpAccountingStandardUpdateAndChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpAccountingStandardUpdateAndChangeInAccountingPrincipleTable_019e45e5-3898-7036-adcc-7fb53db3cd70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EbpAccountingStandardUpdateAndChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EbpAccountingStandardUpdateAndChangeInAccountingPrincipleLineItems_019e45e5-3899-739f-9bc2-5a4829a2aab9" xlink:to="loc_us-gaap-ebp_EbpAccountingStandardUpdateAndChangeInAccountingPrincipleTable_019e45e5-3898-7036-adcc-7fb53db3cd70" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45e5-3899-7f08-8fc1-058714cf17b3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EbpAccountingStandardUpdateAndChangeInAccountingPrincipleTable_019e45e5-3898-7036-adcc-7fb53db3cd70" xlink:to="loc_dei_LegalEntityAxis_019e45e5-3899-7f08-8fc1-058714cf17b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e5-3899-7f08-8fc1-058714cf17b3_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45e5-3899-7f08-8fc1-058714cf17b3" xlink:to="loc_dei_EntityDomain_019e45e5-3899-7f08-8fc1-058714cf17b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45e5-3899-72fb-bc51-52f9369021c9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45e5-3899-7f08-8fc1-058714cf17b3" xlink:to="loc_dei_EntityDomain_019e45e5-3899-72fb-bc51-52f9369021c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45e5-3899-78d1-aee9-3305facf3264" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45e5-3899-72fb-bc51-52f9369021c9" xlink:to="loc_tfsl_EBP340573493002Member_019e45e5-3899-78d1-aee9-3305facf3264" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_NewAccountingPronouncementsPolicyTextBlock_019e45e5-3899-7362-ada0-f0f0cbb83473" xlink:href="tfsl-20260625.xsd#tfsl_NewAccountingPronouncementsPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EbpAccountingStandardUpdateAndChangeInAccountingPrincipleLineItems_019e45e5-3899-739f-9bc2-5a4829a2aab9" xlink:to="loc_tfsl_NewAccountingPronouncementsPolicyTextBlock_019e45e5-3899-7362-ada0-f0f0cbb83473" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanFairValueandNAVTables" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanFairValueandNAVTables"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanFairValueandNAVTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019df954-02ab-7f06-9a84-67be1e661977" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019df954-02ab-7479-902c-229501b1d8e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019df954-02ab-7f06-9a84-67be1e661977" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019df954-02ab-7479-902c-229501b1d8e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019df954-02ab-7cf7-b19a-ffd36168ace4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019df954-02ab-7479-902c-229501b1d8e4" xlink:to="loc_us-gaap_InvestmentTypeAxis_019df954-02ab-7cf7-b19a-ffd36168ace4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019df954-02ab-7cf7-b19a-ffd36168ace4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019df954-02ab-7cf7-b19a-ffd36168ace4" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019df954-02ab-7cf7-b19a-ffd36168ace4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019df954-02ab-7d2b-9586-265c4cbc8eb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019df954-02ab-7cf7-b19a-ffd36168ace4" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019df954-02ab-7d2b-9586-265c4cbc8eb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_019df959-8614-7665-b3e8-89af3d0cd2b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019df954-02ab-7d2b-9586-265c4cbc8eb0" xlink:to="loc_us-gaap_CertificatesOfDepositMember_019df959-8614-7665-b3e8-89af3d0cd2b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentCompaniesMember_019df95c-0802-7bef-8124-67cc39e060f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentCompaniesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019df954-02ab-7d2b-9586-265c4cbc8eb0" xlink:to="loc_us-gaap_OtherInvestmentCompaniesMember_019df95c-0802-7bef-8124-67cc39e060f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019df963-a7d8-7814-9e55-28576bc4d2eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019df954-02ab-7d2b-9586-265c4cbc8eb0" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019df963-a7d8-7814-9e55-28576bc4d2eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019df967-01f0-77ef-a1cd-84003d990826" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019df954-02ab-7d2b-9586-265c4cbc8eb0" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019df967-01f0-77ef-a1cd-84003d990826" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e02e7-9845-745d-9754-5257a5b38c56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019df954-02ab-7d2b-9586-265c4cbc8eb0" xlink:to="loc_us-gaap_CommonStockMember_019e02e7-9845-745d-9754-5257a5b38c56" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019df955-9b1a-730c-9368-49aa08fed7bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019df954-02ab-7479-902c-229501b1d8e4" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019df955-9b1a-730c-9368-49aa08fed7bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019df955-9b1a-730c-9368-49aa08fed7bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019df955-9b1a-730c-9368-49aa08fed7bf" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019df955-9b1a-730c-9368-49aa08fed7bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019df955-9b1a-73f2-931a-97c3b2ee44ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019df955-9b1a-730c-9368-49aa08fed7bf" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019df955-9b1a-73f2-931a-97c3b2ee44ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019df955-cab6-7866-8c98-c3b3b35fac78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019df955-9b1a-73f2-931a-97c3b2ee44ea" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019df955-cab6-7866-8c98-c3b3b35fac78" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019df962-03b8-7470-a6d3-370a82979ef2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019df955-9b1a-73f2-931a-97c3b2ee44ea" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019df962-03b8-7470-a6d3-370a82979ef2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019df962-4ea0-75d2-b763-b68cf561ef33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019df955-9b1a-73f2-931a-97c3b2ee44ea" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019df962-4ea0-75d2-b763-b68cf561ef33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019df956-2288-77d7-8bc8-bf4cbf5fc8ff" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019df954-02ab-7479-902c-229501b1d8e4" xlink:to="loc_dei_LegalEntityAxis_019df956-2288-77d7-8bc8-bf4cbf5fc8ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019df956-2288-77d7-8bc8-bf4cbf5fc8ff_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019df956-2288-77d7-8bc8-bf4cbf5fc8ff" xlink:to="loc_dei_EntityDomain_019df956-2288-77d7-8bc8-bf4cbf5fc8ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019df956-2288-7e73-9676-a78572a20f3d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019df956-2288-77d7-8bc8-bf4cbf5fc8ff" xlink:to="loc_dei_EntityDomain_019df956-2288-7e73-9676-a78572a20f3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019df956-334f-7b41-ac33-1042dc4c38aa" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019df956-2288-7e73-9676-a78572a20f3d" xlink:to="loc_tfsl_EBP340573493002Member_019df956-334f-7b41-ac33-1042dc4c38aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019df954-02ab-78b3-a88b-414489b74bfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019df954-02ab-7f06-9a84-67be1e661977" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019df954-02ab-78b3-a88b-414489b74bfe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpFairValueInvestmentNavUnfundedCommitment_019e4068-e609-7993-994a-1cee00d3a93d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EbpFairValueInvestmentNavUnfundedCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019df954-02ab-7f06-9a84-67be1e661977" xlink:to="loc_us-gaap-ebp_EbpFairValueInvestmentNavUnfundedCommitment_019e4068-e609-7993-994a-1cee00d3a93d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock_019e4b06-ccf1-7787-a7d5-773d2e2c6d17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019df954-02ab-7f06-9a84-67be1e661977" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock_019e4b06-ccf1-7787-a7d5-773d2e2c6d17" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanDescriptionofPlanDetails" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanDescriptionofPlanDetails"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanDescriptionofPlanDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e45d7-11de-789b-9dc0-ed60a0db1344" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e45d7-11de-789b-9dc0-ed60a0db1344" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45d7-11de-7f5c-9ef2-bae7cac9d9d2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e45d7-11de-789b-9dc0-ed60a0db1344" xlink:to="loc_dei_LegalEntityAxis_019e45d7-11de-7f5c-9ef2-bae7cac9d9d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45d7-11de-7f5c-9ef2-bae7cac9d9d2_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45d7-11de-7f5c-9ef2-bae7cac9d9d2" xlink:to="loc_dei_EntityDomain_019e45d7-11de-7f5c-9ef2-bae7cac9d9d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45d7-11de-71e9-84ff-1e243cfd93ea" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45d7-11de-7f5c-9ef2-bae7cac9d9d2" xlink:to="loc_dei_EntityDomain_019e45d7-11de-71e9-84ff-1e243cfd93ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45d7-11de-7110-8798-01d7c3148ba6" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45d7-11de-71e9-84ff-1e243cfd93ea" xlink:to="loc_tfsl_EBP340573493002Member_019e45d7-11de-7110-8798-01d7c3148ba6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage_019e45d7-11de-7792-87f8-ee8137516bbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage_019e45d7-11de-7792-87f8-ee8137516bbb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage_019e45d9-500a-75cd-9cbc-6dd36a182339" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage_019e45d9-500a-75cd-9cbc-6dd36a182339" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBPEmployerContributionTierIIDiscretionaryPercentage_019e45d9-6c4f-7518-86ce-9aadb30bf2f7" xlink:href="tfsl-20260625.xsd#tfsl_EBPEmployerContributionTierIIDiscretionaryPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:to="loc_tfsl_EBPEmployerContributionTierIIDiscretionaryPercentage_019e45d9-6c4f-7518-86ce-9aadb30bf2f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBPEmployerContributionTierIIIDiscretionaryPercentage_019e45d9-82b7-7909-a787-86424c256121" xlink:href="tfsl-20260625.xsd#tfsl_EBPEmployerContributionTierIIIDiscretionaryPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:to="loc_tfsl_EBPEmployerContributionTierIIIDiscretionaryPercentage_019e45d9-82b7-7909-a787-86424c256121" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount_019e45d9-a609-7729-833c-5840ad399bc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccount_019e45d9-a609-7729-833c-5840ad399bc1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForEmployerContribution_019e45d9-b9e3-78b7-822c-083f41d54f50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForEmployerContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForEmployerContribution_019e45d9-b9e3-78b7-822c-083f41d54f50" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForAdministrativeExpense_019e45d9-cdce-7b86-b6c1-405fc943d676" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanForfeitedNonvestedAccountDecreaseForAdministrativeExpense_019e45d9-cdce-7b86-b6c1-405fc943d676" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitTransferToFromExternalPlan_019e45d9-e94c-7f73-a183-d99e05171336" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitTransferToFromExternalPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitTransferToFromExternalPlan_019e45d9-e94c-7f73-a183-d99e05171336" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBPAssetHeldForInvestmentNonAccrualStatusParticipantLoanAfterDeemedDistribution_019e45e8-3c3a-7aea-afbe-788735c12655" xlink:href="tfsl-20260625.xsd#tfsl_EBPAssetHeldForInvestmentNonAccrualStatusParticipantLoanAfterDeemedDistribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e45d7-11de-7571-8078-e98e8ce8b55a" xlink:to="loc_tfsl_EBPAssetHeldForInvestmentNonAccrualStatusParticipantLoanAfterDeemedDistribution_019e45e8-3c3a-7aea-afbe-788735c12655" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanFairValueandNAVDetails" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanFairValueandNAVDetails"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanFairValueandNAVDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e45da-291f-76be-be06-8afaf2f3fa4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e45da-291f-73f9-a2f6-6e41bcb5f23c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e45da-291f-76be-be06-8afaf2f3fa4d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e45da-291f-73f9-a2f6-6e41bcb5f23c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45da-291f-78b3-811a-1be868ef7b08" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e45da-291f-73f9-a2f6-6e41bcb5f23c" xlink:to="loc_dei_LegalEntityAxis_019e45da-291f-78b3-811a-1be868ef7b08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45da-291f-78b3-811a-1be868ef7b08_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45da-291f-78b3-811a-1be868ef7b08" xlink:to="loc_dei_EntityDomain_019e45da-291f-78b3-811a-1be868ef7b08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45da-291f-7771-9e75-82d06c74b0bc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45da-291f-78b3-811a-1be868ef7b08" xlink:to="loc_dei_EntityDomain_019e45da-291f-7771-9e75-82d06c74b0bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45da-291f-7aab-ae25-2b47fa469cdf" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45da-291f-7771-9e75-82d06c74b0bc" xlink:to="loc_tfsl_EBP340573493002Member_019e45da-291f-7aab-ae25-2b47fa469cdf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e45da-45cf-7d9b-930e-2342ec2727e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e45da-291f-73f9-a2f6-6e41bcb5f23c" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e45da-45cf-7d9b-930e-2342ec2727e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-45cf-7d9b-930e-2342ec2727e1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e45da-45cf-7d9b-930e-2342ec2727e1" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-45cf-7d9b-930e-2342ec2727e1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-45cf-7de8-97bd-79d3ef5757c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e45da-45cf-7d9b-930e-2342ec2727e1" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-45cf-7de8-97bd-79d3ef5757c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e45da-45cf-7516-8e4b-28e3cfbf1fc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-45cf-7de8-97bd-79d3ef5757c1" xlink:to="loc_us-gaap_CommonStockMember_019e45da-45cf-7516-8e4b-28e3cfbf1fc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_019e45da-6cf3-729f-89a5-0e4bcead8862" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-45cf-7de8-97bd-79d3ef5757c1" xlink:to="loc_us-gaap_CertificatesOfDepositMember_019e45da-6cf3-729f-89a5-0e4bcead8862" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentCompaniesMember_019e4af1-1869-78b4-be7f-f4a1696b74e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentCompaniesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-45cf-7de8-97bd-79d3ef5757c1" xlink:to="loc_us-gaap_OtherInvestmentCompaniesMember_019e4af1-1869-78b4-be7f-f4a1696b74e3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4af1-1869-7dd5-b635-d463eb3134d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-45cf-7de8-97bd-79d3ef5757c1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4af1-1869-7dd5-b635-d463eb3134d6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019e4af1-1869-74ea-acc8-383fd106df83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-45cf-7de8-97bd-79d3ef5757c1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019e4af1-1869-74ea-acc8-383fd106df83" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4af1-1868-7d58-84e0-35a3982fd2a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e45da-291f-73f9-a2f6-6e41bcb5f23c" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4af1-1868-7d58-84e0-35a3982fd2a9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4af1-1868-7d58-84e0-35a3982fd2a9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4af1-1868-7d58-84e0-35a3982fd2a9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4af1-1868-7d58-84e0-35a3982fd2a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4af1-1869-7f74-a56e-a70c481a3e54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4af1-1868-7d58-84e0-35a3982fd2a9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4af1-1869-7f74-a56e-a70c481a3e54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e4af1-1869-7d17-9a53-ee1bc03f551e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4af1-1869-7f74-a56e-a70c481a3e54" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e4af1-1869-7d17-9a53-ee1bc03f551e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e4af1-1869-794e-949b-ad1517b0697c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4af1-1869-7f74-a56e-a70c481a3e54" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e4af1-1869-794e-949b-ad1517b0697c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e4af1-1869-75b4-989b-9a56e32163ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4af1-1869-7f74-a56e-a70c481a3e54" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e4af1-1869-75b4-989b-9a56e32163ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019e4b0e-b1b5-7cc4-b8b0-088ac91bb4bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e45da-291f-73f9-a2f6-6e41bcb5f23c" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019e4b0e-b1b5-7cc4-b8b0-088ac91bb4bd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019e4b0e-b1b5-7cc4-b8b0-088ac91bb4bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019e4b0e-b1b5-7cc4-b8b0-088ac91bb4bd" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019e4b0e-b1b5-7cc4-b8b0-088ac91bb4bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019e4b0e-b1b5-717f-bef9-312c886b5ec0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019e4b0e-b1b5-7cc4-b8b0-088ac91bb4bd" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019e4b0e-b1b5-717f-bef9-312c886b5ec0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketApproachValuationTechniqueMember_019e4b11-1efc-764f-9ae9-8e08d11bd4fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketApproachValuationTechniqueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019e4b0e-b1b5-717f-bef9-312c886b5ec0" xlink:to="loc_us-gaap_MarketApproachValuationTechniqueMember_019e4b11-1efc-764f-9ae9-8e08d11bd4fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostApproachValuationTechniqueMember_019e4b11-5577-7da3-ac50-fe3804fd3fb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostApproachValuationTechniqueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019e4b0e-b1b5-717f-bef9-312c886b5ec0" xlink:to="loc_us-gaap_CostApproachValuationTechniqueMember_019e4b11-5577-7da3-ac50-fe3804fd3fb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_ValuationMarketAndCostApproachMember_019e4b1a-b560-7b8a-afe4-32ab81765147" xlink:href="tfsl-20260625.xsd#tfsl_ValuationMarketAndCostApproachMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019e4b0e-b1b5-717f-bef9-312c886b5ec0" xlink:to="loc_tfsl_ValuationMarketAndCostApproachMember_019e4b1a-b560-7b8a-afe4-32ab81765147" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentAccumulatedGainLoss_019e45da-291f-75e1-85f6-0d2fe7d315f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentAccumulatedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e45da-291f-76be-be06-8afaf2f3fa4d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentAccumulatedGainLoss_019e45da-291f-75e1-85f6-0d2fe7d315f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBPInvestmentIncreaseFromInterestAndDividendIncomeOnInvestment_019e45da-5d1a-753a-88a0-e5fa4a00d4bd" xlink:href="tfsl-20260625.xsd#tfsl_EBPInvestmentIncreaseFromInterestAndDividendIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e45da-291f-76be-be06-8afaf2f3fa4d" xlink:to="loc_tfsl_EBPInvestmentIncreaseFromInterestAndDividendIncomeOnInvestment_019e45da-5d1a-753a-88a0-e5fa4a00d4bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBPInvestmentIncreaseFromInterestIncomeOnInvestment_019e45da-6cf3-70d1-aaf1-27375ffdd4cb" xlink:href="tfsl-20260625.xsd#tfsl_EBPInvestmentIncreaseFromInterestIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e45da-291f-76be-be06-8afaf2f3fa4d" xlink:to="loc_tfsl_EBPInvestmentIncreaseFromInterestIncomeOnInvestment_019e45da-6cf3-70d1-aaf1-27375ffdd4cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBPInvestmentIncreaseFromDividendIncomeOnInvestment_019e45da-7e02-7d14-bd50-2f3a40a649e1" xlink:href="tfsl-20260625.xsd#tfsl_EBPInvestmentIncreaseFromDividendIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e45da-291f-76be-be06-8afaf2f3fa4d" xlink:to="loc_tfsl_EBPInvestmentIncreaseFromDividendIncomeOnInvestment_019e45da-7e02-7d14-bd50-2f3a40a649e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e4b0e-8675-7aec-ab72-5fbbd6339f38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e45da-291f-76be-be06-8afaf2f3fa4d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e4b0e-8675-7aec-ab72-5fbbd6339f38" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanNonparticipantDirectedInvestmentDetails" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanNonparticipantDirectedInvestmentDetails"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanNonparticipantDirectedInvestmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentLineItems_019e45da-c4c4-7162-aaf0-dcea3811c0a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTable_019e45da-c4c4-7416-b943-8ad0eef01d32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentLineItems_019e45da-c4c4-7162-aaf0-dcea3811c0a1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTable_019e45da-c4c4-7416-b943-8ad0eef01d32" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e45da-c4c4-7c2d-aec1-fd1c8be5c6c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTable_019e45da-c4c4-7416-b943-8ad0eef01d32" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e45da-c4c4-7c2d-aec1-fd1c8be5c6c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-c4c4-7c2d-aec1-fd1c8be5c6c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e45da-c4c4-7c2d-aec1-fd1c8be5c6c9" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-c4c4-7c2d-aec1-fd1c8be5c6c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-c4c4-755c-939c-96008114a914" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e45da-c4c4-7c2d-aec1-fd1c8be5c6c9" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-c4c4-755c-939c-96008114a914" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e45da-c4c4-75fb-b327-43d89e78e2a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e45da-c4c4-755c-939c-96008114a914" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e45da-c4c4-75fb-b327-43d89e78e2a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45da-c4c4-7b3c-a68d-9c3cb0a6374c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentTable_019e45da-c4c4-7416-b943-8ad0eef01d32" xlink:to="loc_dei_LegalEntityAxis_019e45da-c4c4-7b3c-a68d-9c3cb0a6374c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45da-c4c4-7b3c-a68d-9c3cb0a6374c_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45da-c4c4-7b3c-a68d-9c3cb0a6374c" xlink:to="loc_dei_EntityDomain_019e45da-c4c4-7b3c-a68d-9c3cb0a6374c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45da-c4c4-7291-83fd-41207148e14e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45da-c4c4-7b3c-a68d-9c3cb0a6374c" xlink:to="loc_dei_EntityDomain_019e45da-c4c4-7291-83fd-41207148e14e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45da-c4c4-7cea-8f00-9ca2356a302f" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45da-c4c4-7291-83fd-41207148e14e" xlink:to="loc_tfsl_EBP340573493002Member_019e45da-c4c4-7cea-8f00-9ca2356a302f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e45da-c4c4-7abb-b9ff-44c6ae7eeacb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentLineItems_019e45da-c4c4-7162-aaf0-dcea3811c0a1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e45da-c4c4-7abb-b9ff-44c6ae7eeacb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentEmployerCommonStockToTotalAssetPercentage_019e45da-f167-7f53-907a-3f45505a0a85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentEmployerCommonStockToTotalAssetPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonparticipantDirectedInvestmentLineItems_019e45da-c4c4-7162-aaf0-dcea3811c0a1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentEmployerCommonStockToTotalAssetPercentage_019e45da-f167-7f53-907a-3f45505a0a85" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanRelatedPartyandPartyinInterestTransactionsDetails" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanRelatedPartyandPartyinInterestTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanRelatedPartyandPartyinInterestTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e45db-1ae7-72b0-880f-7343fda734e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e45db-1ae7-7e39-9c2a-f67cc4e66733" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e45db-1ae7-72b0-880f-7343fda734e9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e45db-1ae7-7e39-9c2a-f67cc4e66733" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e45db-1ae7-7fa1-9650-8f1e32b28e23" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e45db-1ae7-7e39-9c2a-f67cc4e66733" xlink:to="loc_dei_LegalEntityAxis_019e45db-1ae7-7fa1-9650-8f1e32b28e23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45db-1ae7-7fa1-9650-8f1e32b28e23_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e45db-1ae7-7fa1-9650-8f1e32b28e23" xlink:to="loc_dei_EntityDomain_019e45db-1ae7-7fa1-9650-8f1e32b28e23_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e45db-1ae7-7d2d-bdfb-6a2471f63ad4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e45db-1ae7-7fa1-9650-8f1e32b28e23" xlink:to="loc_dei_EntityDomain_019e45db-1ae7-7d2d-bdfb-6a2471f63ad4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019e45db-1ae7-78ff-83f9-da07eb6e05a8" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e45db-1ae7-7d2d-bdfb-6a2471f63ad4" xlink:to="loc_tfsl_EBP340573493002Member_019e45db-1ae7-78ff-83f9-da07eb6e05a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustCost_019e45db-1ae7-7313-a329-555f86ac77d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e45db-1ae7-72b0-880f-7343fda734e9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustCost_019e45db-1ae7-7313-a329-555f86ac77d1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanScheduleAssetHeldforInvestmentDetails" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanScheduleAssetHeldforInvestmentDetails"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanScheduleAssetHeldforInvestmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIdentifierAxis_019dfdac-69c8-757d-b0c7-1fd4cf5c9741" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIdentifierAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:to="loc_us-gaap_InvestmentIdentifierAxis_019dfdac-69c8-757d-b0c7-1fd4cf5c9741" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019dfdc2-980e-7ae8-8060-00411bbab6a3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:to="loc_srt_RangeAxis_019dfdc2-980e-7ae8-8060-00411bbab6a3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfdc2-980e-7ae8-8060-00411bbab6a3_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019dfdc2-980e-7ae8-8060-00411bbab6a3" xlink:to="loc_srt_RangeMember_019dfdc2-980e-7ae8-8060-00411bbab6a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfdc2-980e-7175-9b75-194c8cbaa671" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019dfdc2-980e-7ae8-8060-00411bbab6a3" xlink:to="loc_srt_RangeMember_019dfdc2-980e-7175-9b75-194c8cbaa671" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019dfdc2-ae83-7e10-92ed-3ef3928ddae1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfdc2-980e-7175-9b75-194c8cbaa671" xlink:to="loc_srt_MinimumMember_019dfdc2-ae83-7e10-92ed-3ef3928ddae1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019dfdc4-355a-749a-8eee-5ee8ea2a2cfe" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfdc2-980e-7175-9b75-194c8cbaa671" xlink:to="loc_srt_MaximumMember_019dfdc4-355a-749a-8eee-5ee8ea2a2cfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019dfdc2-e386-7f43-b078-70c7fceb8966" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:to="loc_dei_LegalEntityAxis_019dfdc2-e386-7f43-b078-70c7fceb8966" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019dfdc2-e386-7f43-b078-70c7fceb8966_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019dfdc2-e386-7f43-b078-70c7fceb8966" xlink:to="loc_dei_EntityDomain_019dfdc2-e386-7f43-b078-70c7fceb8966_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019dfdc2-e386-7a8e-8fae-de17b8a485ac" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019dfdc2-e386-7f43-b078-70c7fceb8966" xlink:to="loc_dei_EntityDomain_019dfdc2-e386-7a8e-8fae-de17b8a485ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019dfdc2-f077-7f9f-9657-450500437659" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019dfdc2-e386-7a8e-8fae-de17b8a485ac" xlink:to="loc_tfsl_EBP340573493002Member_019dfdc2-f077-7f9f-9657-450500437659" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4aee-8c70-7973-a43f-a2c21ba7afa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4aee-8c70-7973-a43f-a2c21ba7afa7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7973-a43f-a2c21ba7afa7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4aee-8c70-7973-a43f-a2c21ba7afa7" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7973-a43f-a2c21ba7afa7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7f59-868e-432dedbd6687" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4aee-8c70-7973-a43f-a2c21ba7afa7" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7f59-868e-432dedbd6687" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e4aee-8c70-77f9-8c06-e29ec1a96659" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7f59-868e-432dedbd6687" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e4aee-8c70-77f9-8c06-e29ec1a96659" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e4aee-8c70-7c54-81b1-840a6e25803b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7f59-868e-432dedbd6687" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e4aee-8c70-7c54-81b1-840a6e25803b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e4aee-8c70-7a75-be3a-586c1672db1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7f59-868e-432dedbd6687" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e4aee-8c70-7a75-be3a-586c1672db1f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e4aee-8c70-7d71-89fe-58d63092233c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e4aee-8c70-7d71-89fe-58d63092233c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7d71-89fe-58d63092233c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e4aee-8c70-7d71-89fe-58d63092233c" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7d71-89fe-58d63092233c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e4aee-8c70-7d71-89fe-58d63092233c" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentCompaniesMember_019e4aee-8c70-78e8-9127-4429383a53a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentCompaniesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:to="loc_us-gaap_OtherInvestmentCompaniesMember_019e4aee-8c70-78e8-9127-4429383a53a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4aee-8c70-7334-bfea-23b4c7c995cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4aee-8c70-7334-bfea-23b4c7c995cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_019e4aee-8c70-7b0e-ba53-3222e75931b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:to="loc_us-gaap_CertificatesOfDepositMember_019e4aee-8c70-7b0e-ba53-3222e75931b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019e4aee-8c70-7e9f-87f8-4d5d954da189" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019e4aee-8c70-7e9f-87f8-4d5d954da189" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest_019dfdab-4244-7bb0-a10a-105a2c34baa8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest_019dfdab-4244-7bb0-a10a-105a2c34baa8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution_019dfdc5-5515-7cf9-ae32-8c716a18f84a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution_019dfdc5-5515-7cf9-ae32-8c716a18f84a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration_019dfdae-4948-75b7-98a5-8872f43c043c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration_019dfdae-4948-75b7-98a5-8872f43c043c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration_019dfdb5-031a-7c70-ab35-bac1a81919b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration_019dfdb5-031a-7c70-ab35-bac1a81919b7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration_019dfdb8-3ae6-7e98-a7ab-38456a2d6c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration_019dfdb8-3ae6-7e98-a7ab-38456a2d6c5a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue_019dfdb9-4cc8-7d17-987a-b3497f726903" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue_019dfdb9-4cc8-7d17-987a-b3497f726903" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019dfdc3-b452-7419-9573-d1a4c44218e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019dfdc3-b452-7419-9573-d1a4c44218e7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment_019dfdc8-d9c2-72ef-bd8f-073f8d477c97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment_019dfdc8-d9c2-72ef-bd8f-073f8d477c97" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e45e3-2975-77d0-b032-72761beb8a97" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e45e3-2975-77d0-b032-72761beb8a97" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e45e3-3fad-7ffe-a6bf-691d5e1650c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanPlanNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e45e3-3fad-7ffe-a6bf-691d5e1650c1" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.thirdfederal.com/role/EmployeeBenefitPlanScheduleAssetHeldforInvestmentDetails_1" xlink:type="simple" xlink:href="tfsl-20260625.xsd#EmployeeBenefitPlanScheduleAssetHeldforInvestmentDetails_1"/>
  <link:definitionLink xlink:role="http://www.thirdfederal.com/role/EmployeeBenefitPlanScheduleAssetHeldforInvestmentDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019dfdc2-980e-7ae8-8060-00411bbab6a3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:to="loc_srt_RangeAxis_019dfdc2-980e-7ae8-8060-00411bbab6a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfdc2-980e-7ae8-8060-00411bbab6a3_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019dfdc2-980e-7ae8-8060-00411bbab6a3" xlink:to="loc_srt_RangeMember_019dfdc2-980e-7ae8-8060-00411bbab6a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019dfdc2-980e-7175-9b75-194c8cbaa671" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019dfdc2-980e-7ae8-8060-00411bbab6a3" xlink:to="loc_srt_RangeMember_019dfdc2-980e-7175-9b75-194c8cbaa671" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019dfdc2-ae83-7e10-92ed-3ef3928ddae1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfdc2-980e-7175-9b75-194c8cbaa671" xlink:to="loc_srt_MinimumMember_019dfdc2-ae83-7e10-92ed-3ef3928ddae1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019dfdc4-355a-749a-8eee-5ee8ea2a2cfe" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019dfdc2-980e-7175-9b75-194c8cbaa671" xlink:to="loc_srt_MaximumMember_019dfdc4-355a-749a-8eee-5ee8ea2a2cfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019dfdc2-e386-7f43-b078-70c7fceb8966" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:to="loc_dei_LegalEntityAxis_019dfdc2-e386-7f43-b078-70c7fceb8966" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019dfdc2-e386-7f43-b078-70c7fceb8966_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019dfdc2-e386-7f43-b078-70c7fceb8966" xlink:to="loc_dei_EntityDomain_019dfdc2-e386-7f43-b078-70c7fceb8966_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019dfdc2-e386-7a8e-8fae-de17b8a485ac" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019dfdc2-e386-7f43-b078-70c7fceb8966" xlink:to="loc_dei_EntityDomain_019dfdc2-e386-7a8e-8fae-de17b8a485ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_tfsl_EBP340573493002Member_019dfdc2-f077-7f9f-9657-450500437659" xlink:href="tfsl-20260625.xsd#tfsl_EBP340573493002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019dfdc2-e386-7a8e-8fae-de17b8a485ac" xlink:to="loc_tfsl_EBP340573493002Member_019dfdc2-f077-7f9f-9657-450500437659" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4aee-8c70-7973-a43f-a2c21ba7afa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4aee-8c70-7973-a43f-a2c21ba7afa7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7973-a43f-a2c21ba7afa7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4aee-8c70-7973-a43f-a2c21ba7afa7" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7973-a43f-a2c21ba7afa7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7f59-868e-432dedbd6687" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4aee-8c70-7973-a43f-a2c21ba7afa7" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7f59-868e-432dedbd6687" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e4aee-8c70-77f9-8c06-e29ec1a96659" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7f59-868e-432dedbd6687" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e4aee-8c70-77f9-8c06-e29ec1a96659" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e4aee-8c70-7c54-81b1-840a6e25803b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7f59-868e-432dedbd6687" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e4aee-8c70-7c54-81b1-840a6e25803b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e4aee-8c70-7a75-be3a-586c1672db1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4aee-8c70-7f59-868e-432dedbd6687" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e4aee-8c70-7a75-be3a-586c1672db1f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e4aee-8c70-7d71-89fe-58d63092233c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019dfdab-4244-7c12-b460-633d61f370d9" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e4aee-8c70-7d71-89fe-58d63092233c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7d71-89fe-58d63092233c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e4aee-8c70-7d71-89fe-58d63092233c" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7d71-89fe-58d63092233c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e4aee-8c70-7d71-89fe-58d63092233c" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentCompaniesMember_019e4aee-8c70-78e8-9127-4429383a53a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentCompaniesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:to="loc_us-gaap_OtherInvestmentCompaniesMember_019e4aee-8c70-78e8-9127-4429383a53a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4aee-8c70-7334-bfea-23b4c7c995cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4aee-8c70-7334-bfea-23b4c7c995cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_019e4aee-8c70-7b0e-ba53-3222e75931b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:to="loc_us-gaap_CertificatesOfDepositMember_019e4aee-8c70-7b0e-ba53-3222e75931b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019e4aee-8c70-7e9f-87f8-4d5d954da189" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4aee-8c70-7794-8846-af293cefbae1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember_019e4aee-8c70-7e9f-87f8-4d5d954da189" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest_019dfdab-4244-7bb0-a10a-105a2c34baa8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentPartyInInterest_019dfdab-4244-7bb0-a10a-105a2c34baa8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution_019dfdc5-5515-7cf9-ae32-8c716a18f84a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution_019dfdc5-5515-7cf9-ae32-8c716a18f84a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration_019dfdae-4948-75b7-98a5-8872f43c043c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentIssuerNameExtensibleEnumeration_019dfdae-4948-75b7-98a5-8872f43c043c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration_019dfdb5-031a-7c70-ab35-bac1a81919b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentTypeExtensibleEnumeration_019dfdb5-031a-7c70-ab35-bac1a81919b7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration_019dfdb8-3ae6-7e98-a7ab-38456a2d6c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustParticipationStatusExtensibleEnumeration_019dfdb8-3ae6-7e98-a7ab-38456a2d6c5a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue_019dfdb9-4cc8-7d17-987a-b3497f726903" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentInvestmentExcludingPlanInterestInMasterTrustCurrentValue_019dfdb9-4cc8-7d17-987a-b3497f726903" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019dfdc3-b452-7419-9573-d1a4c44218e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019dfdc3-b452-7419-9573-d1a4c44218e7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment_019dfdc8-d9c2-72ef-bd8f-073f8d477c97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestment_019dfdc8-d9c2-72ef-bd8f-073f8d477c97" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e45e3-2975-77d0-b032-72761beb8a97" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e45e3-2975-77d0-b032-72761beb8a97" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e45e3-3fad-7ffe-a6bf-691d5e1650c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanPlanNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019dfdab-4244-7fdb-a519-c8b9003ea8d9" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e45e3-3fad-7ffe-a6bf-691d5e1650c1" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/ebp/elts/us-gaap-ebp-2025.xsd#us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPooledSeparateAccountMember" xlink:type="arc" order="31"/>
  </link:definitionLink>
</link:linkbase>
