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irrefragable

[ih-ref-ruh-guh-buh l] /ɪˈrɛf rə gə bəl/
adjective
1.
not to be disputed or contested.
Origin
1525-1535
1525-35; < Late Latin irrefragābilis, equivalent to Latin ir- ir-2 + refragā() to resist, oppose + -bilis -ble
Related forms
irrefragability, irrefragableness, noun
irrefragably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for irrefragably

irrefragable

/ɪˈrɛfrəɡəbəl/
adjective
1.
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 irrefragably
irrefragable
"that cannot be refuted," 1533, from L.L. irrefragabilis, from L. in- "not" + refragari "to oppose, contest," from re- "back" + frag-, base of frangere "to break" (see fraction).
Online Etymology Dictionary, © 2010 Douglas Harper
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