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[kuh n-kloo-siv] /kənˈklu sɪv/
serving to settle or decide a question; decisive; convincing:
conclusive evidence.
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 forms
conclusively, adverb
conclusiveness, noun
nonconclusive, adjective
nonconclusively, adverb
nonconclusiveness, noun
1. definitive, determining. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for conclusive
  • Evolution cannot be done as an experiment in a lab to provide conclusive proof that it really does happen.
  • It finds no conclusive evidence of the conflagration's cause, which remains an open question.
  • With morning comes a conclusive and spectacular answer.
  • The familiar mirror test gives no conclusive results in his opinion.
  • But the site of the village-and conclusive evidence about the fate of the colonists-has eluded historians and archaeologists.
  • Although tantalizing, these data were not conclusive.
  • The fact that a revolver was found beside the body with one chamber empty is accepted as conclusive proof that he killed himself.
  • However, conclusive proof of this hybridization has not yet been established.
  • Hematocrit etc are indirect markers, and not conclusive of anything but a need to be suspicious.
  • Veterinarians are thus far stumped for a conclusive reason.
British Dictionary definitions for conclusive


putting an end to doubt; decisive; final
approaching or involving an end or conclusion
Derived Forms
conclusively, adverb
conclusiveness, 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
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Word Origin and History for conclusive

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
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