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probative (adj.)

"serving to test or prove; pertaining to proof or demonstration," mid-15c., probatiffe, from Old French probatif and directly from Latin probativus "belonging to proof," from probat-, past-participle stem of probare "show, prove, demonstrate" (see prove). Originally in terme probatiffe "a period of time assigned for the proving of an allegation."

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Definitions of probative from WordNet

probative (adj.)
tending to prove a particular proposition or to persuade you of the truth of an allegation;
evidence should only be excluded if its probative value was outweighed by its prejudicial effect
Synonyms: probatory
From wordnet.princeton.edu