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conclusive

[kuh n-kloo-siv]
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adjective
  1. serving to settle or decide a question; decisive; convincing: conclusive evidence.
  2. tending to terminate; closing.

Origin of conclusive

1580–90; < Late Latin conclūsīvus, equivalent to Latin conclūs(us) (past participle of conclūdere to conclude; see conclusion) + -īvus -ive
Related formscon·clu·sive·ly, adverbcon·clu·sive·ness, nounnon·con·clu·sive, adjectivenon·con·clu·sive·ly, adverbnon·con·clu·sive·ness, noun

Synonyms

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1. definitive, determining.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for conclusive

conclusive

adjective
  1. putting an end to doubt; decisive; final
  2. approaching or involving an end or conclusion
Derived Formsconclusively, adverbconclusiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for conclusive

adj.

1610s, "occurring at the end," from French conclusif, from Late Latin conclusivus, from conclus-, past participle stem of concludere (see conclude). Meaning "definitive, decisive, convincing" (putting an end to debate) is from 1640s. Related: Conclusiveness.

Online Etymology Dictionary, © 2010 Douglas Harper