decisive Meaning in the Cambridge English Dictionary
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Meaning of “decisive” in the English Dictionary

"decisive" in British English

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decisiveadjective

uk   us   /dɪˈsaɪ.sɪv/
B2 able to make ​decisionsquickly and ​confidently, or ​showing this ​quality: You need to be more decisive. a decisive ​reply
Opposite
C1 stronglyaffecting how a ​situation will ​progress or end: These ​results could ​prove decisive in ​establishing the criminal's ​identity. a decisive ​role a decisive ​victory
More examples
decisively
adverb uk   us   /-li/
C2 If we had ​actedearlier and more decisively (= more ​quickly and ​effectively) it might not have come to this.
decisiveness
noun [U] uk   us   /-nəs/
(Definition of decisive from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"decisive" in American English

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decisiveadjective

 us   /dɪˈsɑɪ·sɪv/
making ​choicesquickly and ​surely, without having any ​doubts: In an ​emergency, decisive ​action is called for. Decisive also ​means without ​doubt or ​question, and of the ​greatestimportance: DNAtestresults were decisive in ​proving his ​innocence.
decisively
adverb  us   /dɪˈsɑɪ·sɪv·li/
We had to ​actquickly and decisively to put out the ​fire.
(Definition of decisive from the Cambridge Academic Content Dictionary © Cambridge University Press)
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