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1. Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive. A decisive, irrevocable doom. bates. Decisive campaign. Macaulay. Decisive proof.

2. Marked by promptness and decision. A noble instance of this attribute of the decisive character. (j. Foster)

Synonym: decided, positive, conclusive. See decided.

Decisively, Decisiveness.

Origin: cf. F. Decisif. See decision.