decisive

Etymology

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

adj

  1. Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.
    decisive vote
    A decisive battle is fatal for one side's war chances
    In truth, Tottenham never really looked like taking all three points and this defeat means they face a battle to reach the knockout stages -with their next home game against PAOK Salonika on 30 November likely to prove decisive. November 3, 2011, Chris Bevan, “Rubin Kazan 1 - 0 Tottenham”, in BBC Sport
  2. Marked by promptness and decision.
    decisive action
    A noble instance of this attribute of the decisive character. 1804, John Foster, Essays, in a Series of Letters

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