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]