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Adjective: probatory  'prow-bu,to-ree [N. Amer], prow-bu-t(u-)ree [Brit]
  1. Tending to prove a particular proposition or to persuade you of the truth of an allegation
    "evidence should only be excluded if its probatory value was outweighed by its prejudicial effect";
    - probative

See also: important, significant