<?xml version="1.0" encoding="US-ASCII"?>  
<!-- Generated by CompSci Transform (tm) - http://www.compsciresources.com -->    
<!-- Created: Wed Jan 07 20:56:40 UTC 2026 -->  
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  <roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#CompensationNaturesOnly" roleURI="http://xbrl.sec.gov/spac/role/CompensationNaturesOnly"/>   
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    <loc xlink:type="locator" xlink:label="wlac_LessOverallotmentLiabilityMember" xlink:href="wlac-20260107.xsd#wlac_LessOverallotmentLiabilityMember"/>   
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    <loc xlink:type="locator" xlink:label="wlac_LessDeferredUnderwritingCommissionMember" xlink:href="wlac-20260107.xsd#wlac_LessDeferredUnderwritingCommissionMember"/>    
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    <loc xlink:type="locator" xlink:label="wlac_LessRedemptionsMember" xlink:href="wlac-20260107.xsd#wlac_LessRedemptionsMember"/> 
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    <loc xlink:type="locator" xlink:label="wlac_WillowLaneSponsorIILLCMember" xlink:href="wlac-20260107.xsd#wlac_WillowLaneSponsorIILLCMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllSpacSponsorsAffiliatesOrPromotersMember" xlink:to="wlac_WillowLaneSponsorIILLCMember" order="13" xbrldt:closed="true"/>   
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    <loc xlink:type="locator" xlink:label="wlac_FullOverAllotmentMember" xlink:href="wlac-20260107.xsd#wlac_FullOverAllotmentMember"/>     
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllRedemptionLevelsMember" xlink:to="wlac_FullOverAllotmentMember" order="18" xbrldt:closed="true"/> 
  </definitionLink>     
  <definitionLink xlink:role="http://xbrl.sec.gov/spac/role/CompensationNaturesOnly" xlink:type="extended">   
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    <loc xlink:type="locator" xlink:label="wlac_ClassBOrdinarySharesMember" xlink:href="wlac-20260107.xsd#wlac_ClassBOrdinarySharesMember"/> 
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllCompensationNaturesMember" xlink:to="wlac_ClassBOrdinarySharesMember" order="17" xbrldt:closed="true"/>  
    <loc xlink:type="locator" xlink:label="wlac_PrivatePlacementUnitsMember" xlink:href="wlac-20260107.xsd#wlac_PrivatePlacementUnitsMember"/>   
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    <loc xlink:type="locator" xlink:label="us-gaap_OverAllotmentOptionMember" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OverAllotmentOptionMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllCompensationNaturesMember" xlink:to="us-gaap_OverAllotmentOptionMember" order="19" xbrldt:closed="true"/>    
    <loc xlink:type="locator" xlink:label="wlac_RepaymentOfLoansMember" xlink:href="wlac-20260107.xsd#wlac_RepaymentOfLoansMember"/>   
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllCompensationNaturesMember" xlink:to="wlac_RepaymentOfLoansMember" order="20" xbrldt:closed="true"/>   
    <loc xlink:type="locator" xlink:label="wlac_WorkingCapitalLoansMember" xlink:href="wlac-20260107.xsd#wlac_WorkingCapitalLoansMember"/>    
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="spac_AllCompensationNaturesMember" xlink:to="wlac_WorkingCapitalLoansMember" order="21" xbrldt:closed="true"/> 
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    <loc xlink:type="locator" xlink:label="wlac_SponsorOfficersAndDirectorsLetterAgreementMember" xlink:href="wlac-20260107.xsd#wlac_SponsorOfficersAndDirectorsLetterAgreementMember"/>     
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    <loc xlink:type="locator" xlink:label="wlac_SponsorMember" xlink:href="wlac-20260107.xsd#wlac_SponsorMember"/>     
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    <loc xlink:type="locator" xlink:label="wlac_ConsultingAgreementsMember" xlink:href="wlac-20260107.xsd#wlac_ConsultingAgreementsMember"/> 
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    <loc xlink:type="locator" xlink:label="wlac_PersonnelMember" xlink:href="wlac-20260107.xsd#wlac_PersonnelMember"/>    
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    <loc xlink:type="locator" xlink:label="wlac_SponsorOrMemberOfOurManagementTeamMember" xlink:href="wlac-20260107.xsd#wlac_SponsorOrMemberOfOurManagementTeamMember"/>    
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    <loc xlink:type="locator" xlink:label="spac_SpacSponsorAndItsAffiliatesMember" xlink:href="https://xbrl.sec.gov/spac/2025q3/spac-2025q3.xsd#spac_SpacSponsorAndItsAffiliatesMember"/> 
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