'Decisive' definitions:

Definition of 'decisive'

(from WordNet)
adjective
Determining or having the power to determine an outcome; "cast the decisive vote"; "two factors had a decisive influence" [ant: indecisive]
adjective
Unmistakable; "had a decisive lead in the polls"
adjective
Characterized by decision and firmness; "an able and decisive young woman"; "we needed decisive leadership"; "she gave him a decisive answer" [ant: indecisive]
adjective
Forming or having the nature of a turning point or crisis; "a critical point in the campaign"; "the critical test" [syn: critical, decisive]

Definition of 'Decisive'

From: GCIDE
  • 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]

Synonyms of 'decisive'

From: Moby Thesaurus