conclusive

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

Origin:
1580–90; < Late Latin conclūsīvus, equivalent to Latin conclūs(us) (past participle of conclūdere to conclude; see conclusion) + -īvus -ive

conclusively, adverb
conclusiveness, noun
nonconclusive, adjective
nonconclusively, adverb
nonconclusiveness, noun


1. definitive, determining.
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World English Dictionary
conclusive (kənˈkluːsɪv)
 
adj
1.  putting an end to doubt; decisive; final
2.  approaching or involving an end or conclusion
 
con'clusively
 
adv
 
con'clusiveness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

conclusive
1610s, "occurring at the end," from L.L. conclusivus, from conclus-, pp. stem of concludere (see conclude). Meaning "definitive, decisive, convincing" (putting an end to debate) is from 1640s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
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.
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