/ Dictionary / Index I irreversible: Meaning and Definition of Find definitions for: ir•re•vers•i•ble Pronunciation: (ir"i-vûr'su-bul), [key] — adj. not reversible; incapable of being changed: His refusal is irreversible. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: irreversible (Thesaurus) irreverent irrevocable Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language