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[ih-ref-ruh-guh-buh l] /ɪˈrɛf rə gə bəl/
not to be disputed or contested.
Origin of irrefragable
1525-35; < Late Latin irrefragābilis, equivalent to Latin ir- ir-2 + refragā() to resist, oppose + -bilis -ble
Related forms
irrefragability, irrefragableness, noun
irrefragably, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for irrefragable
  • Having this irrefragable evidence in favor of the wisdom of their course they took courage and went on as they had begun.
British Dictionary definitions for irrefragable


not able to be denied or refuted; indisputable
Derived Forms
irrefragability, irrefragableness, noun
irrefragably, adverb
Word Origin
C16: from Late Latin irrefrāgābilis, from Latin ir- + refrāgārī to resist, thwart
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for irrefragable

"that cannot be refuted," 1530s, from Late Latin irrefragabilis, from assimilated form of in- "not, opposite of" (see in- (1)) + Latin refragari "to oppose, contest," from re- "back" (see re-) + frag-, base of frangere "to break" (see fraction). Related: irrefragably; irrefragability.

Online Etymology Dictionary, © 2010 Douglas Harper
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