/ Dictionary / Index A Adrian IV: Meaning and Definition of Find definitions for: Adrian IV Pronunciation: [key] — (Nicholas Breakspear), c1100–59, only Englishman to become pope, 1154–59. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Adrian III Adrian V Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language