/ Dictionary / Index A ad inf.: Meaning and Definition of Find definitions for: ad inf. Pronunciation: [key] ad infinitum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Adigranth ad infinitum Related Content Daily Word Quiz: pedagogy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language