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irrevocable

[ih-rev-uh-kuh-buh l]
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adjective
  1. not to be revoked or recalled; unable to be repealed or annulled; unalterable: an irrevocable decree.
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Origin of irrevocable

First recorded in 1350–1400; Middle English word from Latin word irrevocābilis. See ir-2, revocable
Related formsir·rev·o·ca·bil·i·ty, ir·rev·o·ca·ble·ness, nounir·rev·o·ca·bly, adverbnon·ir·rev·o·ca·bil·i·ty, nounnon·ir·rev·o·ca·ble, adjectivenon·ir·rev·o·ca·ble·ness, nounnon·ir·rev·o·ca·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for irrevocable

irrevocable

adjective
  1. not able to be revoked, changed, or undone; unalterable
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Derived Formsirrevocability or irrevocableness, nounirrevocably, adverb
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 irrevocable

adj.

also irrevokable, late 14c., from Latin irrevocabilis "that cannot be recalled, unalterable," from assimilated form of in- "not, opposite of" (see in- (1)) + revocabilis (see revoke). Related: Irrevocably.

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Online Etymology Dictionary, © 2010 Douglas Harper