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irreversible

[ir-i-vur-suh-buh l] /ˌɪr ɪˈvɜr sə bəl/
adjective
1.
not reversible; incapable of being changed:
His refusal is irreversible.
Origin of irreversible
1620-1630
1620-30; ir-2 + reversible
Related forms
irreversibility, irreversibleness, noun
irreversibly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for irreversible

irreversible

/ˌɪrɪˈvɜːsəbəl/
adjective
1.
not able to be reversed: the irreversible flow of time
2.
not able to be revoked or repealed; irrevocable
3.
(chem, physics) capable of changing or producing a change in one direction only: an irreversible reaction
4.
(thermodynamics) (of a change, process, etc) occurring through a number of intermediate states that are not all in thermodynamic equilibrium
Derived Forms
irreversibility, irreversibleness, noun
irreversibly, adverb
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 irreversible
adj.

1620s, from assimilated form of in- (1) "not, opposite of" + reversible. Related: Irreversibly.

Online Etymology Dictionary, © 2010 Douglas Harper
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17
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