Etymology

decisive

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Today it means: Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive. Full definition →

Middle French décisif
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The story

  1. Middle French · derived fromdécisif
  2. English todaydecisive

From Middle French décisif, equivalent to decide + -ive.

Etymology from Wiktionary, CC BY-SA 4.0.