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