Definify.com
Webster 1913 Edition
Decisive
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. 
2. 
Marked by promptness and decision. 
– De-ci′sive-ly
, adv.
 De-ci′sive-ness
, Noun.
Webster 1828 Edition
Decisive
DECI'SIVE
, a.Definition 2025
decisive
decisive
See also: décisive
English
Adjective
decisive (comparative more decisive, superlative most decisive)
-  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
 -  2011 November 3, Chris Bevan, “Rubin Kazan 1 - 0 Tottenham”, in BBC Sport:- 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.
 
Synonyms
Antonyms
Derived terms
Related terms
Translations
having the power or quality of deciding a question or controversy
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marked by promptness and decision
References
- decisive in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- decisive in The Century Dictionary, The Century Co., New York, 1911