Breadcrumb Home > Dictionary > Index I irreligion: Meaning and Definition of Find definitions for: ir•re•li•gion Pronunciation: (ir"i-lij'un), [key] — n. lack of religion. hostility or indifference to religion; impiety. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: irreligion (Thesaurus) irrelievable irreligious ✖ Related Content Daily Word Quiz: piquant Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language