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From The Collaborative International Dictionary of English v.0.48:
Decisive \De*ci*sive\, a. [Cf. F. d['e]cisif. See Decision.] 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." --Hallam. [1913 Webster] 2. Marked by promptness and decision. [1913 Webster] A noble instance of this attribute of the decisive character. --J. Foster. Syn: Decided; positive; conclusive. See Decided. -- De*ci"sive*ly, adv. -- De*ci"sive*ness, n. [1913 Webster]