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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e4718-dcb7-79dd-b589-8ec6fc84309b,g:80ab1ebb-a7ec-45c8-8524-ff99ecf9a110-->
<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.kennametal.com/role/COVER" xlink:type="simple" xlink:href="kmt-20260626.xsd#COVER"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/COVER" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019e4718-dcb7-7345-b674-040845aa1eba" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019e4718-dcb7-7752-b114-2e9685256aa2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019e4718-dcb7-7345-b674-040845aa1eba" xlink:to="loc_dei_DocumentInformationTable_019e4718-dcb7-7752-b114-2e9685256aa2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7c97-a80e-8ceccd63aa4a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019e4718-dcb7-7752-b114-2e9685256aa2" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7c97-a80e-8ceccd63aa4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7c97-a80e-8ceccd63aa4a_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7c97-a80e-8ceccd63aa4a" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7c97-a80e-8ceccd63aa4a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-70c0-b215-9d718c60c5c3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7c97-a80e-8ceccd63aa4a" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-70c0-b215-9d718c60c5c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-7e8f-9381-e745b3b4f416" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-70c0-b215-9d718c60c5c3" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-7e8f-9381-e745b3b4f416" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e4718-dcb7-7385-bad4-ef7449717654" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4718-dcb7-7345-b674-040845aa1eba" xlink:to="loc_dei_DocumentType_019e4718-dcb7-7385-bad4-ef7449717654" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e4718-dcb7-7775-8882-5063818c43f5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4718-dcb7-7345-b674-040845aa1eba" xlink:to="loc_dei_EntityRegistrantName_019e4718-dcb7-7775-8882-5063818c43f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e4718-dcb7-703c-bad4-dc1fe425c83a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4718-dcb7-7345-b674-040845aa1eba" xlink:to="loc_dei_EntityCentralIndexKey_019e4718-dcb7-703c-bad4-dc1fe425c83a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e4718-dcb7-7a80-a1f3-8df9b513b8bb" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019e4718-dcb7-7345-b674-040845aa1eba" xlink:to="loc_dei_AmendmentFlag_019e4718-dcb7-7a80-a1f3-8df9b513b8bb" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/STATEMENTSOFNETASSETSAVAILABLEFORBENEFITS" xlink:type="simple" xlink:href="kmt-20260626.xsd#STATEMENTSOFNETASSETSAVAILABLEFORBENEFITS"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/STATEMENTSOFNETASSETSAVAILABLEFORBENEFITS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e4718-dcb7-7cf6-b218-9600c9c19e45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019e4718-dcb7-7faf-a116-37022a00e671" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e4718-dcb7-7cf6-b218-9600c9c19e45" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019e4718-dcb7-7faf-a116-37022a00e671" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7775-9c43-2a5c5e7a1f5a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitTable_019e4718-dcb7-7faf-a116-37022a00e671" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7775-9c43-2a5c5e7a1f5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7775-9c43-2a5c5e7a1f5a_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7775-9c43-2a5c5e7a1f5a" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7775-9c43-2a5c5e7a1f5a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7f9c-b056-42be8f5d8fbd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7775-9c43-2a5c5e7a1f5a" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7f9c-b056-42be8f5d8fbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-70d8-adfd-d6e0f6483d2d" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7f9c-b056-42be8f5d8fbd" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-70d8-adfd-d6e0f6483d2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAbstract_019e4718-dcb7-7927-aad9-93b004802b97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e4718-dcb7-7cf6-b218-9600c9c19e45" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAbstract_019e4718-dcb7-7927-aad9-93b004802b97" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPlanInterestInMasterTrustFairValue_019e4718-dcb7-7f00-ae48-9fc8f26af41e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentPlanInterestInMasterTrustFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAbstract_019e4718-dcb7-7927-aad9-93b004802b97" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPlanInterestInMasterTrustFairValue_019e4718-dcb7-7f00-ae48-9fc8f26af41e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPlanInterestInMasterTrustContractValue_019e4718-dcb7-77a5-a82a-fc5bb457b2af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentPlanInterestInMasterTrustContractValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAbstract_019e4718-dcb7-7927-aad9-93b004802b97" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPlanInterestInMasterTrustContractValue_019e4718-dcb7-77a5-a82a-fc5bb457b2af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPlanInterestInMasterTrustFairAndContractValue_019e4718-dcb7-791f-9afe-c226bd3a663b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentPlanInterestInMasterTrustFairAndContractValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAbstract_019e4718-dcb7-7927-aad9-93b004802b97" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPlanInterestInMasterTrustFairAndContractValue_019e4718-dcb7-791f-9afe-c226bd3a663b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e4718-dcb7-7928-898b-50bed862227a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e4718-dcb7-7cf6-b218-9600c9c19e45" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e4718-dcb7-7928-898b-50bed862227a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable_019e4718-dcb7-7dd3-9baf-6f458bf50298" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e4718-dcb7-7928-898b-50bed862227a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionReceivable_019e4718-dcb7-7dd3-9baf-6f458bf50298" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionReceivable_019e4718-dcb7-72f7-a0f8-c2086e86b11a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantContributionReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e4718-dcb7-7928-898b-50bed862227a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionReceivable_019e4718-dcb7-72f7-a0f8-c2086e86b11a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant_019e4718-dcb7-79f2-8e86-55e84dd5cd32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e4718-dcb7-7928-898b-50bed862227a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipant_019e4718-dcb7-79f2-8e86-55e84dd5cd32" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanReceivable_019e4718-dcb7-72b3-8ed3-73a85d487092" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanReceivableAbstract_019e4718-dcb7-7928-898b-50bed862227a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanReceivable_019e4718-dcb7-72b3-8ed3-73a85d487092" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e4718-dcb7-7cb1-8284-bfc0971ad352" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfNetAssetAvailableForBenefitLineItems_019e4718-dcb7-7cf6-b218-9600c9c19e45" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e4718-dcb7-7cb1-8284-bfc0971ad352" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/STATEMENTOFCHANGESINNETASSETSAVAILABLEFORBENEFITS" xlink:type="simple" xlink:href="kmt-20260626.xsd#STATEMENTOFCHANGESINNETASSETSAVAILABLEFORBENEFITS"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/STATEMENTOFCHANGESINNETASSETSAVAILABLEFORBENEFITS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e4718-dcb7-726d-9301-9517c51f8fbb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019e4718-dcb7-7807-ad4d-519a65384b31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e4718-dcb7-726d-9301-9517c51f8fbb" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019e4718-dcb7-7807-ad4d-519a65384b31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7018-831e-6233a1828e2f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitTable_019e4718-dcb7-7807-ad4d-519a65384b31" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7018-831e-6233a1828e2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7018-831e-6233a1828e2f_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7018-831e-6233a1828e2f" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7018-831e-6233a1828e2f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7e15-b552-b5ed34dd0a69" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7018-831e-6233a1828e2f" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7e15-b552-b5ed34dd0a69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-775b-91f5-ccd80d14203c" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7e15-b552-b5ed34dd0a69" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-775b-91f5-ccd80d14203c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract_019e4718-dcb7-7fc1-8872-b503981117cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e4718-dcb7-726d-9301-9517c51f8fbb" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract_019e4718-dcb7-7fc1-8872-b503981117cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019e4718-dcb7-788e-b008-02ac22cb6a67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract_019e4718-dcb7-7fc1-8872-b503981117cc" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019e4718-dcb7-788e-b008-02ac22cb6a67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant_019e4718-dcb7-758a-bec8-356f63a0a941" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract_019e4718-dcb7-7fc1-8872-b503981117cc" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestIncomeOnNoteReceivableFromParticipant_019e4718-dcb7-758a-bec8-356f63a0a941" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e4718-dcb7-755e-a93c-0c5672eb4935" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract_019e4718-dcb7-7fc1-8872-b503981117cc" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e4718-dcb7-755e-a93c-0c5672eb4935" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019e4718-dcb7-7861-b9cf-51ff13806149" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e4718-dcb7-755e-a93c-0c5672eb4935" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForEmployerContributionCash_019e4718-dcb7-7861-b9cf-51ff13806149" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution_019e4718-dcb7-7dae-a1b1-6eebd3d071f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e4718-dcb7-755e-a93c-0c5672eb4935" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContribution_019e4718-dcb7-7dae-a1b1-6eebd3d071f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover_019e4718-dcb7-7045-84aa-8778cff221e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e4718-dcb7-755e-a93c-0c5672eb4935" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForParticipantContributionRollover_019e4718-dcb7-7045-84aa-8778cff221e7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution_019e4718-dcb7-76d3-a826-a75c05187676" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContributionAbstract_019e4718-dcb7-755e-a93c-0c5672eb4935" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForContribution_019e4718-dcb7-76d3-a826-a75c05187676" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease_019e4718-dcb7-7be1-b6d2-949e9fef1f5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseAbstract_019e4718-dcb7-7fc1-8872-b503981117cc" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncrease_019e4718-dcb7-7be1-b6d2-949e9fef1f5f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e4718-dcb7-716b-83e5-c6c8c4fbcda4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e4718-dcb7-726d-9301-9517c51f8fbb" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e4718-dcb7-716b-83e5-c6c8c4fbcda4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant_019e4718-dcb7-7f65-9330-beb2957204d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e4718-dcb7-716b-83e5-c6c8c4fbcda4" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForPaymentToParticipant_019e4718-dcb7-7f65-9330-beb2957204d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense_019e4718-dcb7-7e25-92cf-16da68819fe9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e4718-dcb7-716b-83e5-c6c8c4fbcda4" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseForAdministrativeExpense_019e4718-dcb7-7e25-92cf-16da68819fe9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease_019e4718-dcb7-7c78-92e9-225bc56e93b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecreaseAbstract_019e4718-dcb7-716b-83e5-c6c8c4fbcda4" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitDecrease_019e4718-dcb7-7c78-92e9-225bc56e93b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease_019e4718-dcb7-7cfa-9932-e6079221a78f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e4718-dcb7-726d-9301-9517c51f8fbb" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecrease_019e4718-dcb7-7cfa-9932-e6079221a78f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefitAbstract_019e4718-dcb7-750f-88da-3d11a1b8119b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefitAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanStatementOfChangeInNetAssetAvailableForBenefitLineItems_019e4718-dcb7-726d-9301-9517c51f8fbb" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefitAbstract_019e4718-dcb7-750f-88da-3d11a1b8119b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e4718-dcb7-780c-9303-d818031572a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefitAbstract_019e4718-dcb7-750f-88da-3d11a1b8119b" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e4718-dcb7-780c-9303-d818031572a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e4718-dcb7-79f2-9c14-29acf12df877" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/DESCRIPTIONOFPLAN" xlink:type="simple" xlink:href="kmt-20260626.xsd#DESCRIPTIONOFPLAN"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/DESCRIPTIONOFPLAN" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-7346-8fc1-587dc08c37be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e4718-dcb7-763d-86e5-f97e682711d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-7346-8fc1-587dc08c37be" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e4718-dcb7-763d-86e5-f97e682711d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-70eb-a41d-17659e53f923" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e4718-dcb7-763d-86e5-f97e682711d7" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-70eb-a41d-17659e53f923" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-70eb-a41d-17659e53f923_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-70eb-a41d-17659e53f923" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-70eb-a41d-17659e53f923_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7971-bdd1-c251039f1662" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-70eb-a41d-17659e53f923" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7971-bdd1-c251039f1662" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-728e-b700-041f02c1fccc" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7971-bdd1-c251039f1662" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-728e-b700-041f02c1fccc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock_019e4718-dcb7-774d-96cd-71002f1a5f11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-7346-8fc1-587dc08c37be" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTextBlock_019e4718-dcb7-774d-96cd-71002f1a5f11" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" xlink:type="simple" xlink:href="kmt-20260626.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-78a8-bdd0-b90157203789" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e4718-dcb7-7df1-94d4-88f19d5c77d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-78a8-bdd0-b90157203789" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e4718-dcb7-7df1-94d4-88f19d5c77d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-71c4-bf30-e737fe17f126" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e4718-dcb7-7df1-94d4-88f19d5c77d5" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-71c4-bf30-e737fe17f126" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-71c4-bf30-e737fe17f126_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-71c4-bf30-e737fe17f126" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-71c4-bf30-e737fe17f126_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-742b-ba84-ff374bfb6787" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-71c4-bf30-e737fe17f126" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-742b-ba84-ff374bfb6787" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-7279-b6f8-b05a4d51eb2f" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-742b-ba84-ff374bfb6787" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-7279-b6f8-b05a4d51eb2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock_019e4718-dcb7-7c83-902f-9beb0349db52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-78a8-bdd0-b90157203789" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanSummaryOfAccountingPolicyTextBlock_019e4718-dcb7-7c83-902f-9beb0349db52" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/INVESTMENTINMASTERTRUST" xlink:type="simple" xlink:href="kmt-20260626.xsd#INVESTMENTINMASTERTRUST"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/INVESTMENTINMASTERTRUST" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7b7d-895c-e3ac069d3b92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7b68-b3af-5db810b2154a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7b7d-895c-e3ac069d3b92" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7b68-b3af-5db810b2154a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7da6-afa4-d86a2c6899c4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7b68-b3af-5db810b2154a" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7da6-afa4-d86a2c6899c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7da6-afa4-d86a2c6899c4_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7da6-afa4-d86a2c6899c4" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7da6-afa4-d86a2c6899c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7272-973a-918d2d4bad7b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7da6-afa4-d86a2c6899c4" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7272-973a-918d2d4bad7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-70c8-aa8a-504f3bfbe495" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7272-973a-918d2d4bad7b" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-70c8-aa8a-504f3bfbe495" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTextBlock_019e4718-dcb7-716a-8210-bea41e6c907e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7b7d-895c-e3ac069d3b92" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTextBlock_019e4718-dcb7-716a-8210-bea41e6c907e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/FAIRVALUEMEASUREMENT" xlink:type="simple" xlink:href="kmt-20260626.xsd#FAIRVALUEMEASUREMENT"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/FAIRVALUEMEASUREMENT" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e4718-dcb7-78cc-af0a-91935b9ede3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e4718-dcb7-78f4-90cc-38a8aefbb691" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e4718-dcb7-78cc-af0a-91935b9ede3d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e4718-dcb7-78f4-90cc-38a8aefbb691" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7b91-a879-d2879b34b4b4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e4718-dcb7-78f4-90cc-38a8aefbb691" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7b91-a879-d2879b34b4b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7b91-a879-d2879b34b4b4_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7b91-a879-d2879b34b4b4" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7b91-a879-d2879b34b4b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-726c-97fb-4d988c9d50c1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7b91-a879-d2879b34b4b4" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-726c-97fb-4d988c9d50c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-7eb0-947e-5cc3dafac741" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-726c-97fb-4d988c9d50c1" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-7eb0-947e-5cc3dafac741" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock_019e4718-dcb7-7c20-9b17-8597cf13c6c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e4718-dcb7-78cc-af0a-91935b9ede3d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTextBlock_019e4718-dcb7-7c20-9b17-8597cf13c6c7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/STABLEVALUEFUND" xlink:type="simple" xlink:href="kmt-20260626.xsd#STABLEVALUEFUND"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/STABLEVALUEFUND" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7941-ae74-0d51d7bb245f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-789d-8d41-eddbadae60dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7941-ae74-0d51d7bb245f" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-789d-8d41-eddbadae60dc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7da3-b87c-e320d9958888" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-789d-8d41-eddbadae60dc" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7da3-b87c-e320d9958888" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7da3-b87c-e320d9958888_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7da3-b87c-e320d9958888" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7da3-b87c-e320d9958888_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7ff4-a519-ba48e7e5beb1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7da3-b87c-e320d9958888" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7ff4-a519-ba48e7e5beb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-75b6-aecc-4bcb48ffd909" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7ff4-a519-ba48e7e5beb1" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-75b6-aecc-4bcb48ffd909" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBPStableValueFundTextBlock_019e4718-dcb7-75b4-b9ef-ba32760cf96c" xlink:href="kmt-20260626.xsd#kmt_EBPStableValueFundTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7941-ae74-0d51d7bb245f" xlink:to="loc_kmt_EBPStableValueFundTextBlock_019e4718-dcb7-75b4-b9ef-ba32760cf96c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/TAXSTATUS" xlink:type="simple" xlink:href="kmt-20260626.xsd#TAXSTATUS"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/TAXSTATUS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e4718-dcb7-7293-9583-60a2d5e8624d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e4718-dcb7-7d32-a984-5625b52eaa78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e4718-dcb7-7293-9583-60a2d5e8624d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e4718-dcb7-7d32-a984-5625b52eaa78" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7959-9c67-bd3492d3f26e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e4718-dcb7-7d32-a984-5625b52eaa78" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7959-9c67-bd3492d3f26e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7959-9c67-bd3492d3f26e_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7959-9c67-bd3492d3f26e" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7959-9c67-bd3492d3f26e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7079-847b-e3c9a7d78986" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7959-9c67-bd3492d3f26e" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7079-847b-e3c9a7d78986" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-7dc4-8f15-38b53878af61" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7079-847b-e3c9a7d78986" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-7dc4-8f15-38b53878af61" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock_019e4718-dcb7-77cf-a323-1758f205242a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e4718-dcb7-7293-9583-60a2d5e8624d" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTextBlock_019e4718-dcb7-77cf-a323-1758f205242a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/PLANTERMINATION" xlink:type="simple" xlink:href="kmt-20260626.xsd#PLANTERMINATION"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/PLANTERMINATION" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e4718-dcb7-7f8f-947f-8079c5b44337" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e4718-dcb7-76ff-af7c-1f71e67823e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e4718-dcb7-7f8f-947f-8079c5b44337" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e4718-dcb7-76ff-af7c-1f71e67823e0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7160-a4e5-0e9a774be0cf" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusTable_019e4718-dcb7-76ff-af7c-1f71e67823e0" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7160-a4e5-0e9a774be0cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7160-a4e5-0e9a774be0cf_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7160-a4e5-0e9a774be0cf" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7160-a4e5-0e9a774be0cf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7cf1-9922-c8ce7c621863" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7160-a4e5-0e9a774be0cf" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7cf1-9922-c8ce7c621863" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-7288-9fbe-3afd1ba1c7e9" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7cf1-9922-c8ce7c621863" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-7288-9fbe-3afd1ba1c7e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock_019e4718-dcb7-75a8-b5a1-a22091303701" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanTaxStatusLineItems_019e4718-dcb7-7f8f-947f-8079c5b44337" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPlanTerminationTextBlock_019e4718-dcb7-75a8-b5a1-a22091303701" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/RISKSANDUNCERTAINTIES" xlink:type="simple" xlink:href="kmt-20260626.xsd#RISKSANDUNCERTAINTIES"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/RISKSANDUNCERTAINTIES" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_019e4718-dcb7-74f8-9b9e-bcabfd3f0455" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable_019e4718-dcb7-752d-a15b-0a7f3fd423ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_019e4718-dcb7-74f8-9b9e-bcabfd3f0455" xlink:to="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable_019e4718-dcb7-752d-a15b-0a7f3fd423ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7f44-9637-0fb15018a178" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable_019e4718-dcb7-752d-a15b-0a7f3fd423ad" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7f44-9637-0fb15018a178" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7f44-9637-0fb15018a178_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7f44-9637-0fb15018a178" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7f44-9637-0fb15018a178_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7e95-9672-c00cb0710c8b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7f44-9637-0fb15018a178" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7e95-9672-c00cb0710c8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-7f32-a65e-9b7f0f2d507c" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7e95-9672-c00cb0710c8b" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-7f32-a65e-9b7f0f2d507c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock_019e4718-dcb7-761c-ad49-42ba5c6a72bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_019e4718-dcb7-74f8-9b9e-bcabfd3f0455" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRiskAndUncertaintyTextBlock_019e4718-dcb7-761c-ad49-42ba5c6a72bd" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/RELATEDPARTYTRANSACTIONSANDPARTYININTERESTTRANSACTIONS" xlink:type="simple" xlink:href="kmt-20260626.xsd#RELATEDPARTYTRANSACTIONSANDPARTYININTERESTTRANSACTIONS"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/RELATEDPARTYTRANSACTIONSANDPARTYININTERESTTRANSACTIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-7772-8026-8f16c635c8cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e4718-dcb7-76c8-a8f7-19e43f85c2d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-7772-8026-8f16c635c8cb" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e4718-dcb7-76c8-a8f7-19e43f85c2d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7685-a237-d8c848c71126" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e4718-dcb7-76c8-a8f7-19e43f85c2d6" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7685-a237-d8c848c71126" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7685-a237-d8c848c71126_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7685-a237-d8c848c71126" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7685-a237-d8c848c71126_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-727f-b9b3-4d29a32c78f9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7685-a237-d8c848c71126" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-727f-b9b3-4d29a32c78f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-794a-8671-eddced168b3d" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-727f-b9b3-4d29a32c78f9" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-794a-8671-eddced168b3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock_019e4718-dcb7-7438-acdb-c5bbfd937c8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-7772-8026-8f16c635c8cb" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTextBlock_019e4718-dcb7-7438-acdb-c5bbfd937c8f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/SCHEDULEHLINE4iSCHEDULEOFASSETSHELDATENDOFYEAR" xlink:type="simple" xlink:href="kmt-20260626.xsd#SCHEDULEHLINE4iSCHEDULEOFASSETSHELDATENDOFYEAR"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/SCHEDULEHLINE4iSCHEDULEOFASSETSHELDATENDOFYEAR" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e4718-dcb7-72b4-87c9-cf5d11483fa7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e4718-dcb7-7370-873b-a369d6c9814e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e4718-dcb7-72b4-87c9-cf5d11483fa7" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e4718-dcb7-7370-873b-a369d6c9814e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7387-bad1-0e634b827918" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e4718-dcb7-7370-873b-a369d6c9814e" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7387-bad1-0e634b827918" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7387-bad1-0e634b827918_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7387-bad1-0e634b827918" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7387-bad1-0e634b827918_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-79cd-b122-ae65fd4d4860" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7387-bad1-0e634b827918" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-79cd-b122-ae65fd4d4860" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-7db5-910c-e266a9670d11" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-79cd-b122-ae65fd4d4860" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-7db5-910c-e266a9670d11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock_019e4718-dcb7-7640-a025-705132bc53e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e4718-dcb7-72b4-87c9-cf5d11483fa7" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTableTextBlock_019e4718-dcb7-7640-a025-705132bc53e5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" xlink:type="simple" xlink:href="kmt-20260626.xsd#SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-717f-af66-eba5fa86cd9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e4718-dcb7-7f41-999d-c6279b748cb2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-717f-af66-eba5fa86cd9c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e4718-dcb7-7f41-999d-c6279b748cb2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7fee-a4fe-f3ce596c4ec2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyTable_019e4718-dcb7-7f41-999d-c6279b748cb2" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7fee-a4fe-f3ce596c4ec2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7fee-a4fe-f3ce596c4ec2_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7fee-a4fe-f3ce596c4ec2" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7fee-a4fe-f3ce596c4ec2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7f3a-aea4-cad2662030c7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7fee-a4fe-f3ce596c4ec2" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7f3a-aea4-cad2662030c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-73fb-ac6e-65b8cded9682" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7f3a-aea4-cad2662030c7" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-73fb-ac6e-65b8cded9682" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock_019e4718-dcb7-7654-9389-7964ee5b7c8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-717f-af66-eba5fa86cd9c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanBasisOfAccountingPolicyTextBlock_019e4718-dcb7-7654-9389-7964ee5b7c8f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock_019e4718-dcb7-7b1f-a6d5-fca9581f34dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-717f-af66-eba5fa86cd9c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanUseOfEstimatePolicyTextBlock_019e4718-dcb7-7b1f-a6d5-fca9581f34dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock_019e4718-dcb7-76b5-bfb4-9016ac226602" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-717f-af66-eba5fa86cd9c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentPolicyTextBlock_019e4718-dcb7-76b5-bfb4-9016ac226602" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock_019e4718-dcb7-733d-847c-5441b987c454" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-717f-af66-eba5fa86cd9c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantPolicyTextBlock_019e4718-dcb7-733d-847c-5441b987c454" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock_019e4718-dcb7-70ca-a417-1109f9afb739" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-717f-af66-eba5fa86cd9c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPaymentToParticipantPolicyTextBlock_019e4718-dcb7-70ca-a417-1109f9afb739" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanExpensePolicyTextBlock_019e4718-dcb7-722b-a8e0-d1d93627020f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanExpensePolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-717f-af66-eba5fa86cd9c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanExpensePolicyTextBlock_019e4718-dcb7-722b-a8e0-d1d93627020f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock_019e4718-dcb7-7892-a753-08ad53fbe055" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanAccountingPolicyLineItems_019e4718-dcb7-717f-af66-eba5fa86cd9c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanSubsequentEventPolicyTextBlock_019e4718-dcb7-7892-a753-08ad53fbe055" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/INVESTMENTINMASTERTRUSTTables" xlink:type="simple" xlink:href="kmt-20260626.xsd#INVESTMENTINMASTERTRUSTTables"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/INVESTMENTINMASTERTRUSTTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7223-ad98-43c365d28200" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7342-ac99-cb64bba78231" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7223-ad98-43c365d28200" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7342-ac99-cb64bba78231" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-70ff-9969-18d305482da7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7342-ac99-cb64bba78231" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-70ff-9969-18d305482da7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-70ff-9969-18d305482da7_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-70ff-9969-18d305482da7" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-70ff-9969-18d305482da7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-76b0-bb7f-4cec8a8ac979" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-70ff-9969-18d305482da7" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-76b0-bb7f-4cec8a8ac979" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-7e0d-bed7-370344c7130f" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-76b0-bb7f-4cec8a8ac979" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-7e0d-bed7-370344c7130f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTableTextBlock_019e4718-dcb7-770a-872a-40982597a8a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7223-ad98-43c365d28200" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTableTextBlock_019e4718-dcb7-770a-872a-40982597a8a6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/FAIRVALUEMEASUREMENTTables" xlink:type="simple" xlink:href="kmt-20260626.xsd#FAIRVALUEMEASUREMENTTables"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/FAIRVALUEMEASUREMENTTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e4718-dcb7-7130-b1c2-d0b3f7e7aec2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e4718-dcb7-7bf7-9684-586e75e36cbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e4718-dcb7-7130-b1c2-d0b3f7e7aec2" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e4718-dcb7-7bf7-9684-586e75e36cbf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7b90-98e7-a473761bb250" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTable_019e4718-dcb7-7bf7-9684-586e75e36cbf" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7b90-98e7-a473761bb250" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7b90-98e7-a473761bb250_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7b90-98e7-a473761bb250" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7b90-98e7-a473761bb250_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7b88-98d9-f76196d4d15b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7b90-98e7-a473761bb250" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7b88-98d9-f76196d4d15b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-754d-be16-d63bd3b4e90c" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7b88-98d9-f76196d4d15b" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-754d-be16-d63bd3b4e90c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock_019e4718-dcb7-754f-b848-1142366f402c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavLineItems_019e4718-dcb7-7130-b1c2-d0b3f7e7aec2" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValueAndNavTableTextBlock_019e4718-dcb7-754f-b848-1142366f402c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/DESCRIPTIONOFPLANDetails" xlink:type="simple" xlink:href="kmt-20260626.xsd#DESCRIPTIONOFPLANDetails"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/DESCRIPTIONOFPLANDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e4718-dcb7-7f75-baa0-54842365b048" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e4718-dcb7-7f75-baa0-54842365b048" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7f22-8b70-11bc0f9addb0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e4718-dcb7-7f75-baa0-54842365b048" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7f22-8b70-11bc0f9addb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7f22-8b70-11bc0f9addb0_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7f22-8b70-11bc0f9addb0" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7f22-8b70-11bc0f9addb0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-72f7-aabd-2df50863a59b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7f22-8b70-11bc0f9addb0" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-72f7-aabd-2df50863a59b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-7fd4-aa5d-85a568341bc2" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-72f7-aabd-2df50863a59b" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-7fd4-aa5d-85a568341bc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e4718-dcb7-7b23-803f-d6f6f4bd78d3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanTable_019e4718-dcb7-7f75-baa0-54842365b048" xlink:to="loc_srt_RangeAxis_019e4718-dcb7-7b23-803f-d6f6f4bd78d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4718-dcb7-7b23-803f-d6f6f4bd78d3_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e4718-dcb7-7b23-803f-d6f6f4bd78d3" xlink:to="loc_srt_RangeMember_019e4718-dcb7-7b23-803f-d6f6f4bd78d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4718-dcb7-7a80-8486-539d416f62f4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e4718-dcb7-7b23-803f-d6f6f4bd78d3" xlink:to="loc_srt_RangeMember_019e4718-dcb7-7a80-8486-539d416f62f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e4718-dcb7-7072-adff-2cd872d19d85" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4718-dcb7-7a80-8486-539d416f62f4" xlink:to="loc_srt_MinimumMember_019e4718-dcb7-7072-adff-2cd872d19d85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e4718-dcb7-7d45-a676-e42f6ea7176e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4718-dcb7-7a80-8486-539d416f62f4" xlink:to="loc_srt_MaximumMember_019e4718-dcb7-7d45-a676-e42f6ea7176e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBPParticipantContributionMinimumContributionToEligibleCompensationPercentage_019e4718-dcb7-7da1-9ccc-c34bbeb5221d" xlink:href="kmt-20260626.xsd#kmt_EBPParticipantContributionMinimumContributionToEligibleCompensationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_kmt_EBPParticipantContributionMinimumContributionToEligibleCompensationPercentage_019e4718-dcb7-7da1-9ccc-c34bbeb5221d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBPParticipantContributionMaximumContributionToEligibleCompensationPercentage_019e4718-dcb7-7208-9ff9-466c4959266c" xlink:href="kmt-20260626.xsd#kmt_EBPParticipantContributionMaximumContributionToEligibleCompensationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_kmt_EBPParticipantContributionMaximumContributionToEligibleCompensationPercentage_019e4718-dcb7-7208-9ff9-466c4959266c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate_019e4718-dcb7-7991-a3c8-4cb03d359d7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate_019e4718-dcb7-7991-a3c8-4cb03d359d7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBPParticipantContributionAutomaticAnnualIncreaseDeferralRate_019e4718-dcb7-7a41-a711-f141bc1b0329" xlink:href="kmt-20260626.xsd#kmt_EBPParticipantContributionAutomaticAnnualIncreaseDeferralRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_kmt_EBPParticipantContributionAutomaticAnnualIncreaseDeferralRate_019e4718-dcb7-7a41-a711-f141bc1b0329" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage_019e4718-dcb7-77c1-9a54-876c529709e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage_019e4718-dcb7-77c1-9a54-876c529709e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage_019e4718-dcb7-72c2-a7b7-10e36b748778" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage_019e4718-dcb7-72c2-a7b7-10e36b748778" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBPDistributionsInvoluntaryCashOutLimit_019e4718-dcb7-75ad-bb44-29dfd16cb205" xlink:href="kmt-20260626.xsd#kmt_EBPDistributionsInvoluntaryCashOutLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_kmt_EBPDistributionsInvoluntaryCashOutLimit_019e4718-dcb7-75ad-bb44-29dfd16cb205" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount_019e4718-dcb7-7ccb-99e8-9cd90f764d96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMinimumBorrowingAmount_019e4718-dcb7-7ccb-99e8-9cd90f764d96" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage_019e4718-dcb7-75ab-8b71-43bc34a9240d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage_019e4718-dcb7-75ab-8b71-43bc34a9240d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount_019e4718-dcb7-781a-bea0-5a4e0e05291f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount_019e4718-dcb7-781a-bea0-5a4e0e05291f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBPNoteReceivableFromParticipantGeneralLoanMaximumBorrowingTerm_019e4718-dcb7-70b3-8b26-18c9a043b934" xlink:href="kmt-20260626.xsd#kmt_EBPNoteReceivableFromParticipantGeneralLoanMaximumBorrowingTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_kmt_EBPNoteReceivableFromParticipantGeneralLoanMaximumBorrowingTerm_019e4718-dcb7-70b3-8b26-18c9a043b934" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBPNoteReceivableFromParticipantAccountPrimaryResidenceMaximumBorrowingTerm_019e4718-dcb7-731f-ab32-d61517722bd1" xlink:href="kmt-20260626.xsd#kmt_EBPNoteReceivableFromParticipantAccountPrimaryResidenceMaximumBorrowingTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_kmt_EBPNoteReceivableFromParticipantAccountPrimaryResidenceMaximumBorrowingTerm_019e4718-dcb7-731f-ab32-d61517722bd1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019e4718-dcb7-739a-9274-36138100fbd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems_019e4718-dcb7-714a-8471-cab88407409c" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019e4718-dcb7-739a-9274-36138100fbd7" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/INVESTMENTINMASTERTRUSTScheduleofMasterTrustNetAssetsDetails" xlink:type="simple" xlink:href="kmt-20260626.xsd#INVESTMENTINMASTERTRUSTScheduleofMasterTrustNetAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/INVESTMENTINMASTERTRUSTScheduleofMasterTrustNetAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-79d3-8685-160def3cec5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7191-bc4e-13b6753ce1ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-79d3-8685-160def3cec5b" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7191-bc4e-13b6753ce1ba" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-791e-91de-57b5e2fdeb30" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7191-bc4e-13b6753ce1ba" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-791e-91de-57b5e2fdeb30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-791e-91de-57b5e2fdeb30_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-791e-91de-57b5e2fdeb30" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-791e-91de-57b5e2fdeb30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-72a7-a961-e78abbefd557" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-791e-91de-57b5e2fdeb30" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-72a7-a961-e78abbefd557" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-765b-a404-7e983a574162" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-72a7-a961-e78abbefd557" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-765b-a404-7e983a574162" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustAxis_019e4718-dcb7-7bcf-ba7a-b14c10ffebf4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7191-bc4e-13b6753ce1ba" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustAxis_019e4718-dcb7-7bcf-ba7a-b14c10ffebf4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-7bcf-ba7a-b14c10ffebf4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustAxis_019e4718-dcb7-7bcf-ba7a-b14c10ffebf4" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-7bcf-ba7a-b14c10ffebf4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-77f9-955d-2147ffff283b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustAxis_019e4718-dcb7-7bcf-ba7a-b14c10ffebf4" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-77f9-955d-2147ffff283b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustMember_019e4718-dcb7-7e70-8a0f-17fab0c36f28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-77f9-955d-2147ffff283b" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustMember_019e4718-dcb7-7e70-8a0f-17fab0c36f28" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedPlanInterestInMasterTrustMember_019e4718-dcb7-7c31-b9cd-584ac224529a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedPlanInterestInMasterTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-77f9-955d-2147ffff283b" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedPlanInterestInMasterTrustMember_019e4718-dcb7-7c31-b9cd-584ac224529a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7141-9c1e-2c476bbedc22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7191-bc4e-13b6753ce1ba" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7141-9c1e-2c476bbedc22" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-7141-9c1e-2c476bbedc22_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7141-9c1e-2c476bbedc22" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-7141-9c1e-2c476bbedc22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-78e7-8d41-49ead77139cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7141-9c1e-2c476bbedc22" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-78e7-8d41-49ead77139cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_019e4718-dcb7-7bec-8c59-b8491125f1ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-78e7-8d41-49ead77139cc" xlink:to="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_019e4718-dcb7-7bec-8c59-b8491125f1ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MutualFundMember_019e4718-dcb7-7529-b545-92e8af2a4fbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MutualFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-78e7-8d41-49ead77139cc" xlink:to="loc_us-gaap_MutualFundMember_019e4718-dcb7-7529-b545-92e8af2a4fbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4718-dcb7-7140-a8f1-ee0676a49500" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-78e7-8d41-49ead77139cc" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4718-dcb7-7140-a8f1-ee0676a49500" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanSelfDirectedBrokerageAccountMember_019e4718-dcb7-766f-8555-c25fb9960436" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanSelfDirectedBrokerageAccountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-78e7-8d41-49ead77139cc" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanSelfDirectedBrokerageAccountMember_019e4718-dcb7-766f-8555-c25fb9960436" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValue_019e4718-dcb7-7d21-871e-4d2d4b5fbc1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-79d3-8685-160def3cec5b" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValue_019e4718-dcb7-7d21-871e-4d2d4b5fbc1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValue_019e4718-dcb7-7948-a948-3fdfa0605815" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-79d3-8685-160def3cec5b" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentContractValue_019e4718-dcb7-7948-a948-3fdfa0605815" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e4718-dcb7-7a63-8e00-fa9c96a24a87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-79d3-8685-160def3cec5b" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNetAssetAvailableForBenefit_019e4718-dcb7-7a63-8e00-fa9c96a24a87" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/INVESTMENTINMASTERTRUSTScheduleofNetInvestmentGainDetails" xlink:type="simple" xlink:href="kmt-20260626.xsd#INVESTMENTINMASTERTRUSTScheduleofNetInvestmentGainDetails"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/INVESTMENTINMASTERTRUSTScheduleofNetInvestmentGainDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7c2c-9908-16720eecf7b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7dd3-8d0c-173e72eddb28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7c2c-9908-16720eecf7b1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7dd3-8d0c-173e72eddb28" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7e14-9fe0-cf9081e9a501" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7dd3-8d0c-173e72eddb28" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7e14-9fe0-cf9081e9a501" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7e14-9fe0-cf9081e9a501_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7e14-9fe0-cf9081e9a501" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7e14-9fe0-cf9081e9a501_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7947-9884-7266dc3a108b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7e14-9fe0-cf9081e9a501" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7947-9884-7266dc3a108b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-76fa-8219-94831f372a2b" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7947-9884-7266dc3a108b" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-76fa-8219-94831f372a2b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustAxis_019e4718-dcb7-77c9-84b4-0ca0c0ba04df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7dd3-8d0c-173e72eddb28" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustAxis_019e4718-dcb7-77c9-84b4-0ca0c0ba04df" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-77c9-84b4-0ca0c0ba04df_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustAxis_019e4718-dcb7-77c9-84b4-0ca0c0ba04df" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-77c9-84b4-0ca0c0ba04df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-7349-a5f7-2a8228a80546" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustAxis_019e4718-dcb7-77c9-84b4-0ca0c0ba04df" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-7349-a5f7-2a8228a80546" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustMember_019e4718-dcb7-7500-86b3-748fd4e8522a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustAndPlanInterestInMasterTrustDomain_019e4718-dcb7-7349-a5f7-2a8228a80546" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanNonconsolidatedMasterTrustMember_019e4718-dcb7-7500-86b3-748fd4e8522a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019e4718-dcb7-7959-82ff-3230df5368d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7c2c-9908-16720eecf7b1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForGainLossOnInvestment_019e4718-dcb7-7959-82ff-3230df5368d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestAndDividendIncomeOnInvestment_019e4718-dcb7-7b49-8afe-b0749810a220" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestAndDividendIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7c2c-9908-16720eecf7b1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForInterestAndDividendIncomeOnInvestment_019e4718-dcb7-7b49-8afe-b0749810a220" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment_019e4718-dcb7-7e0f-b5c6-2876614cdab9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-7c2c-9908-16720eecf7b1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseDecreaseForIncomeLossOnInvestment_019e4718-dcb7-7e0f-b5c6-2876614cdab9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/FAIRVALUEMEASUREMENTDetails" xlink:type="simple" xlink:href="kmt-20260626.xsd#FAIRVALUEMEASUREMENTDetails"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/FAIRVALUEMEASUREMENTDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-76e3-9850-4da2f5c5d48a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7a3f-b427-c386de1071e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-76e3-9850-4da2f5c5d48a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7a3f-b427-c386de1071e3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-75bf-80c9-781a1efaeeb3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7a3f-b427-c386de1071e3" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-75bf-80c9-781a1efaeeb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-75bf-80c9-781a1efaeeb3_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-75bf-80c9-781a1efaeeb3" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-75bf-80c9-781a1efaeeb3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7e03-9ced-98346233a3be" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-75bf-80c9-781a1efaeeb3" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7e03-9ced-98346233a3be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-7f48-af5d-eb865d15b48c" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-7e03-9ced-98346233a3be" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-7f48-af5d-eb865d15b48c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4718-dcb7-7385-836f-bc9fa72d7936" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7a3f-b427-c386de1071e3" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4718-dcb7-7385-836f-bc9fa72d7936" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4718-dcb7-7385-836f-bc9fa72d7936_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4718-dcb7-7385-836f-bc9fa72d7936" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4718-dcb7-7385-836f-bc9fa72d7936_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4718-dcb7-7885-9c86-0bad529a04ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4718-dcb7-7385-836f-bc9fa72d7936" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4718-dcb7-7885-9c86-0bad529a04ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel12And3Member_019e4718-dcb7-71f4-8acf-13a3cf467a3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel12And3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4718-dcb7-7885-9c86-0bad529a04ef" xlink:to="loc_us-gaap_FairValueInputsLevel12And3Member_019e4718-dcb7-71f4-8acf-13a3cf467a3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e4718-dcb7-7956-baae-f99415781fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_019e4718-dcb7-71f4-8acf-13a3cf467a3a" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e4718-dcb7-7956-baae-f99415781fe1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e4718-dcb7-7318-b08b-41fab4e076ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_019e4718-dcb7-71f4-8acf-13a3cf467a3a" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e4718-dcb7-7318-b08b-41fab4e076ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e4718-dcb7-70e0-849d-343b9ce73a81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_019e4718-dcb7-71f4-8acf-13a3cf467a3a" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e4718-dcb7-70e0-849d-343b9ce73a81" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e4718-dcb7-7be2-b8c1-95a1d2e87296" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4718-dcb7-7885-9c86-0bad529a04ef" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e4718-dcb7-7be2-b8c1-95a1d2e87296" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7268-a3cd-ad791754b963" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustTable_019e4718-dcb7-7a3f-b427-c386de1071e3" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7268-a3cd-ad791754b963" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-7268-a3cd-ad791754b963_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7268-a3cd-ad791754b963" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-7268-a3cd-ad791754b963_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-71cb-bce6-76bc09d3d4e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7268-a3cd-ad791754b963" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-71cb-bce6-76bc09d3d4e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MutualFundMember_019e4718-dcb7-7dc1-a88e-0367da025c24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MutualFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-71cb-bce6-76bc09d3d4e1" xlink:to="loc_us-gaap_MutualFundMember_019e4718-dcb7-7dc1-a88e-0367da025c24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4718-dcb7-713e-aa4a-138620c0edb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-71cb-bce6-76bc09d3d4e1" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4718-dcb7-713e-aa4a-138620c0edb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e4718-dcb7-7d90-9c43-7edeb3ce0f3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-71cb-bce6-76bc09d3d4e1" xlink:to="loc_us-gaap_CommonStockMember_019e4718-dcb7-7d90-9c43-7edeb3ce0f3b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_019e4718-dcb7-71e0-99b7-184789dd4387" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-71cb-bce6-76bc09d3d4e1" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_019e4718-dcb7-71e0-99b7-184789dd4387" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_019e4718-dcb7-75ad-8f8a-9323894ade32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-71cb-bce6-76bc09d3d4e1" xlink:to="loc_us-gaap_DefinedBenefitPlanCommonCollectiveTrustMember_019e4718-dcb7-75ad-8f8a-9323894ade32" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBPSelfDirectedBrokerageAccountMutualFundMember_019e4718-dcb7-776f-868f-47dac0217bb1" xlink:href="kmt-20260626.xsd#kmt_EBPSelfDirectedBrokerageAccountMutualFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-71cb-bce6-76bc09d3d4e1" xlink:to="loc_kmt_EBPSelfDirectedBrokerageAccountMutualFundMember_019e4718-dcb7-776f-868f-47dac0217bb1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BondsMember_019e4718-dcb7-761d-a7bf-d163fff6f214" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-71cb-bce6-76bc09d3d4e1" xlink:to="loc_us-gaap_BondsMember_019e4718-dcb7-761d-a7bf-d163fff6f214" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentDebtSecuritiesMember_019e4718-dcb7-7642-a86f-7b5af4dbeaa1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-71cb-bce6-76bc09d3d4e1" xlink:to="loc_us-gaap_USGovernmentDebtSecuritiesMember_019e4718-dcb7-7642-a86f-7b5af4dbeaa1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValue_019ed096-737c-7bd1-b561-5991050da7e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanMasterTrustLineItems_019e4718-dcb7-76e3-9850-4da2f5c5d48a" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentFairValue_019ed096-737c-7bd1-b561-5991050da7e5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/RISKSANDUNCERTAINTIESDetails" xlink:type="simple" xlink:href="kmt-20260626.xsd#RISKSANDUNCERTAINTIESDetails"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/RISKSANDUNCERTAINTIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_019e4718-dcb7-7866-9e72-47d429f4fa6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable_019e4718-dcb7-7d4f-9608-b694afd66068" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_019e4718-dcb7-7866-9e72-47d429f4fa6a" xlink:to="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable_019e4718-dcb7-7d4f-9608-b694afd66068" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7578-aa39-e0176cf7b087" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyTable_019e4718-dcb7-7d4f-9608-b694afd66068" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7578-aa39-e0176cf7b087" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7578-aa39-e0176cf7b087_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7578-aa39-e0176cf7b087" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7578-aa39-e0176cf7b087_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-708e-9b8c-8d91aff788b9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7578-aa39-e0176cf7b087" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-708e-9b8c-8d91aff788b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-71d9-91d9-236d75be4866" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-708e-9b8c-8d91aff788b9" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-71d9-91d9-236d75be4866" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToTotalInvestmentsAmount_019e4718-dcb7-7b4e-9fe7-2e213af00ec2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToTotalInvestmentsAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EbpRiskAndUncertaintyLineItems_019e4718-dcb7-7866-9e72-47d429f4fa6a" xlink:to="loc_us-gaap-ebp_EbpRiskAndUncertaintyConcentrationOfInvestmentAtFairValueToTotalInvestmentsAmount_019e4718-dcb7-7b4e-9fe7-2e213af00ec2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/RELATEDPARTYTRANSACTIONSANDPARTYININTERESTTRANSACTIONSDetails" xlink:type="simple" xlink:href="kmt-20260626.xsd#RELATEDPARTYTRANSACTIONSANDPARTYININTERESTTRANSACTIONSDetails"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/RELATEDPARTYTRANSACTIONSANDPARTYININTERESTTRANSACTIONSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-79bb-9de5-4ddc5241e73e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e4718-dcb7-71d4-862f-6349ad1ae748" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-79bb-9de5-4ddc5241e73e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e4718-dcb7-71d4-862f-6349ad1ae748" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7b0f-b4f5-83c143ca41f5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e4718-dcb7-71d4-862f-6349ad1ae748" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7b0f-b4f5-83c143ca41f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7b0f-b4f5-83c143ca41f5_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7b0f-b4f5-83c143ca41f5" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7b0f-b4f5-83c143ca41f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-76a8-9324-bd8835435f10" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7b0f-b4f5-83c143ca41f5" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-76a8-9324-bd8835435f10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-768c-b1c7-56db5d8be6cd" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-76a8-9324-bd8835435f10" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-768c-b1c7-56db5d8be6cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7c14-8151-2ec11ebf93bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsTable_019e4718-dcb7-71d4-862f-6349ad1ae748" xlink:to="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7c14-8151-2ec11ebf93bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-7c14-8151-2ec11ebf93bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7c14-8151-2ec11ebf93bf" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-7c14-8151-2ec11ebf93bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-7f5d-a768-74a6e017f224" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019e4718-dcb7-7c14-8151-2ec11ebf93bf" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-7f5d-a768-74a6e017f224" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4718-dcb7-767e-91e8-e5782725af68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019e4718-dcb7-7f5d-a768-74a6e017f224" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanEmployerCommonStockMember_019e4718-dcb7-767e-91e8-e5782725af68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares_019e4718-dcb7-7018-8e83-68895d14898f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-79bb-9de5-4ddc5241e73e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfShares_019e4718-dcb7-7018-8e83-68895d14898f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e4718-dcb7-7efc-b71f-98e7c37512b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-79bb-9de5-4ddc5241e73e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentExcludingPlanInterestInMasterTrustFairValue_019e4718-dcb7-7efc-b71f-98e7c37512b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment_019e4718-dcb7-7060-8f56-a9b5f4d55029" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-79bb-9de5-4ddc5241e73e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanChangeInNetAssetAvailableForBenefitIncreaseForDividendIncomeOnInvestment_019e4718-dcb7-7060-8f56-a9b5f4d55029" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased_019e4718-dcb7-7901-9de4-260fb1dbf283" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-79bb-9de5-4ddc5241e73e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesPurchased_019e4718-dcb7-7901-9de4-260fb1dbf283" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentAcquiredExcludingPlanInterestInMasterTrustCost_019e4718-dcb7-7b7f-8b02-52631eb301ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentAcquiredExcludingPlanInterestInMasterTrustCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-79bb-9de5-4ddc5241e73e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentAcquiredExcludingPlanInterestInMasterTrustCost_019e4718-dcb7-7b7f-8b02-52631eb301ef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold_019e4718-dcb7-7ae9-9b83-4894168dd7ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-79bb-9de5-4ddc5241e73e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentNumberOfSharesSold_019e4718-dcb7-7ae9-9b83-4894168dd7ff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentSoldExcludingPlanInterestInMasterTrustSellingPrice_019e4718-dcb7-7e19-886e-b2d3b16b7596" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanInvestmentSoldExcludingPlanInterestInMasterTrustSellingPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanRelatedPartyAndPartyInInterestTransactionsLineItems_019e4718-dcb7-79bb-9de5-4ddc5241e73e" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanInvestmentSoldExcludingPlanInterestInMasterTrustSellingPrice_019e4718-dcb7-7e19-886e-b2d3b16b7596" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kennametal.com/role/SCHEDULEHLINE4iSCHEDULEOFASSETSHELDATENDOFYEARDetails" xlink:type="simple" xlink:href="kmt-20260626.xsd#SCHEDULEHLINE4iSCHEDULEOFASSETSHELDATENDOFYEARDetails"/>
  <link:definitionLink xlink:role="http://www.kennametal.com/role/SCHEDULEHLINE4iSCHEDULEOFASSETSHELDATENDOFYEARDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e4718-dcb7-7226-bb09-31aa2e333373" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e4718-dcb7-7fba-aced-96bc21719278" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e4718-dcb7-7226-bb09-31aa2e333373" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e4718-dcb7-7fba-aced-96bc21719278" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4718-dcb7-7a56-afc3-3b1bbf9ca771" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e4718-dcb7-7fba-aced-96bc21719278" xlink:to="loc_dei_LegalEntityAxis_019e4718-dcb7-7a56-afc3-3b1bbf9ca771" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-7a56-afc3-3b1bbf9ca771_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7a56-afc3-3b1bbf9ca771" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-7a56-afc3-3b1bbf9ca771_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4718-dcb7-78ba-a856-01fb7640bc29" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4718-dcb7-7a56-afc3-3b1bbf9ca771" xlink:to="loc_dei_EntityDomain_019e4718-dcb7-78ba-a856-01fb7640bc29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kmt_EBP002Member_019e4718-dcb7-73b2-96f2-e62ed4841f90" xlink:href="kmt-20260626.xsd#kmt_EBP002Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4718-dcb7-78ba-a856-01fb7640bc29" xlink:to="loc_kmt_EBP002Member_019e4718-dcb7-73b2-96f2-e62ed4841f90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e4718-dcb7-7d04-9219-5779328383dc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentTable_019e4718-dcb7-7fba-aced-96bc21719278" xlink:to="loc_srt_RangeAxis_019e4718-dcb7-7d04-9219-5779328383dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4718-dcb7-7d04-9219-5779328383dc_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e4718-dcb7-7d04-9219-5779328383dc" xlink:to="loc_srt_RangeMember_019e4718-dcb7-7d04-9219-5779328383dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4718-dcb7-7fbc-8b92-02b71671fdc2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e4718-dcb7-7d04-9219-5779328383dc" xlink:to="loc_srt_RangeMember_019e4718-dcb7-7fbc-8b92-02b71671fdc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e4718-dcb7-7935-9800-8ec5c414bf8b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4718-dcb7-7fbc-8b92-02b71671fdc2" xlink:to="loc_srt_MinimumMember_019e4718-dcb7-7935-9800-8ec5c414bf8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e4718-dcb7-751f-ba97-25801aca846d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4718-dcb7-7fbc-8b92-02b71671fdc2" xlink:to="loc_srt_MaximumMember_019e4718-dcb7-751f-ba97-25801aca846d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e4718-dcb7-7d69-a33b-7a6257db7d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanPlanNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e4718-dcb7-7226-bb09-31aa2e333373" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanPlanNumber_019e4718-dcb7-7d69-a33b-7a6257db7d9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e4718-dcb7-7ed1-a84f-79a8c6d4f749" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e4718-dcb7-7226-bb09-31aa2e333373" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e4718-dcb7-7ed1-a84f-79a8c6d4f749" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019e4718-dcb7-7d26-8efb-badee3c059c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e4718-dcb7-7226-bb09-31aa2e333373" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanParticipantLoanInterestRate_019e4718-dcb7-7d26-8efb-badee3c059c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution_019e4718-dcb7-71e9-ba46-a7c5f91d7ae9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/ebp/elts/us-gaap-ebp-2026.xsd#us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap-ebp_EmployeeBenefitPlanScheduleOfAssetHeldForInvestmentLineItems_019e4718-dcb7-7226-bb09-31aa2e333373" xlink:to="loc_us-gaap-ebp_EmployeeBenefitPlanAssetHeldForInvestmentParticipantLoanAfterDeemedDistribution_019e4718-dcb7-71e9-ba46-a7c5f91d7ae9" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
