/ Dictionary / Index I irreg.: Meaning and Definition of Find definitions for: irreg. Pronunciation: [key] irregular. irregularly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. irrefutable irregardless 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