Etymology
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decisive (adj.)

1610s, "having the quality or power of determining," from Medieval Latin decisivus, from Latin decis-, past participle stem of decidere "to cut off; decide" (see decide). Meaning "marked by prompt determination" is from 1736. Compare decided. Related: Decisively; decisiveness.

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Definitions of decisive

decisive (adj.)
determining or having the power to determine an outcome;
two factors had a decisive influence
cast the decisive vote
decisive (adj.)
unmistakable;
had a decisive lead in the polls
decisive (adj.)
characterized by decision and firmness;
we needed decisive leadership
an able and decisive young woman
she gave him a decisive answer
decisive (adj.)
forming or having the nature of a turning point or crisis;
Synonyms: critical
From wordnet.princeton.edu