irrefragable

[ih-ref-ruh-guh-buh l]
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Origin of irrefragable

1525–35; < Late Latin irrefragābilis, equivalent to Latin ir- ir-2 + refragā(rī) to resist, oppose + -bilis -ble
Related formsir·ref·ra·ga·bil·i·ty, ir·ref·ra·ga·ble·ness, nounir·ref·ra·ga·bly, adverb
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British Dictionary definitions for irrefragable

irrefragable

adjective
  1. not able to be denied or refuted; indisputable
Derived Formsirrefragability or irrefragableness, nounirrefragably, adverb

Word Origin for irrefragable

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for irrefragable
adj.

"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