/ Dictionary / Index I irrupt: Meaning and Definition of Find definitions for: ir•rupt Pronunciation: (i-rupt'), [key] — v.i. to break or burst in suddenly. to manifest violent activity or emotion, as a group of persons. (of animals) to increase suddenly in numbers through a lessening of the number of deaths. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: irrupt (Thesaurus) irrotational irruption Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language