/ Dictionary / Index G Gregory IV: Meaning and Definition of Find definitions for: Gregory IV Pronunciation: [key] died a.d. 844, pope 827–844. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Gregory III Gregory V Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language