Breadcrumb Home > Dictionary > Index I ign.: Meaning and Definition of Find definitions for: ign. Pronunciation: [key] ignition. unknown. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. IgM Ignatius ✖ Related Content Daily Word Quiz: hortatory Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language