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.
two factors had a decisive influence
cast the decisive vote
had a decisive lead in the polls
we needed decisive leadership
an able and decisive young woman
she gave him a decisive answer
decimation
decimeter
decipher
decipherable
decision
decisive
decivilize
deck
decker
deck-hand
deckle
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