Adjective

(-)

Unable to be retracted or reversed; final.

* , As You Like It act 1, sc. 3:

Firm and irrevocable is my doom

Which I have pass'd upon her; she is banish'd.

* 1848 , , Dombey and Son , ch. 61:

On each face, wonder and fear were painted vividly; each so still and silent, looking at the other over the black gulf of the irrevocable past.

* 2005 April 28, , " Cycling: Cipo retires. Definitely. Absolutely. Yes. Probably," New York Times (retrieved 27 April 2014):

Once again, Mario Cipollini has announced his definite, absolute, unswerving and irrevocable decision to retire, and this time he means it. Probably.

Adjective

(en adjective)

Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.

''A decisive battle is fatal for one side's war chances

* {{quote-news

, year=2011 , date=November 3 , author=Chris Bevan , title=Rubin Kazan 1 - 0 Tottenham , work=BBC Sport citation , page= , passage=In truth, Tottenham never really looked like taking all three points and this defeat means they face a battle to reach the knockout stages -with their next home game against PAOK Salonika on 30 November likely to prove decisive .}}

Marked by promptness and decision.

A noble instance of this attribute of the decisive character. -J. Foster.