presumptive presumptive /priːˈzʌmptɪv/

adjective

1. Affording reasonable grounds for belief or acceptance  ( presumptive )
   affording reasonable grounds for belief or acceptance
    Presumptive evidence
   presumptive evidence
    A strong presumptive case is made out
   a strong presumptive case is made out
   
2. Having a reasonable basis for belief or acceptance  ( presumptive )
   having a reasonable basis for belief or acceptance
    The presumptive heir (or heir apparent)
   the presumptive heir (or heir apparent)