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