1 : serving to prove or demonstrate; "the oath of office is...demonstrative of the legislative opinion on this subject"- John Marshall
2 : established as genuine
3 : 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"
4 : serving as or based on evidence; "evidential signs of a forced entry"; "its evidentiary value"
