/ Dictionary / Index I intra-: Meaning and Definition of Find definitions for: intra- Pronunciation: [key] a prefix meaning “within,” used in the formation of compound words:Cf. intro-. intramural. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. intr. intra-abdominal Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language