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

• (UK) IPA^(key): /dɪˈsaɪsɪv/

  • Audio (Southern England):

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  • Rhymes: -aɪsɪv
• (nonstandard) IPA^(key): /dɪˈsɪsɪv/^[1]

decisive (comparative more decisive, superlative most decisive)

1. Having the power or quality of deciding a question or controversy; putting an end to contest or controversy; final; conclusive.

   decisive vote

   decisive battle

   • 2011 November 3, Chris Bevan, “Rubin Kazan 1 - 0 Tottenham”, in BBC Sport‎^[2]:

     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.

2. Decided; definite; incontrovertible.

   decisive victory

   • 1949, Joseph Campbell, “The Hero and the God”, in The Hero with a Thousand Faces:

     [F]abulous forces are there encountered and a decisive victory is won: […]

3. Marked by promptness and decision.

   decisive action

   • 1804, John Foster, Essays, in a Series of Letters:

     A noble instance of this attribute of the decisive character.

• decided
• positive
• conclusive

• indecisive

• decidable
• decide
• decided

• “decisive”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.
• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “decisive”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.

• iDevices

• IPA^(key): /de.t͡ʃiˈzi.ve/
• Rhymes: -ive
• Hyphenation: de‧ci‧sì‧ve

decisive

1. feminine plural of decisivo