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forming or having the nature of a turning point or crisis
e.g. a critical point in the campaign
e.g. the critical test
Synonym: critical
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determining or having the power to determine an outcome
e.g. cast the decisive vote
e.g. two factors had a decisive influence
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characterized by decision and firmness
e.g. an able and decisive young woman
e.g. we needed decisive leadership
e.g. she gave him a decisive answer
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unmistakable
e.g. had a decisive lead in the polls