Etymology
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presumptive (adj.)

"speculative, based on presumption or probability," mid-15c., from Medieval Latin presumptivus, from Late Latin praesumptivus, from Latin praesumpt- past-participle stem of praesumere (see presume). The heir presumptive (1620s) is "presumed" to be the heir if the heir apparent is unavailable. Related: Presumptively.

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Definitions of presumptive

presumptive (adj.)
having a reasonable basis for belief or acceptance;
the presumptive heir (or heir apparent)
presumptive (adj.)
affording reasonable grounds for belief or acceptance;
a strong presumptive case is made out
presumptive evidence
From wordnet.princeton.edu