/ Dictionary / Index G Gregory XV: Meaning and Definition of Find definitions for: Gregory XV Pronunciation: [key] (Alessandro Ludovisi) 1554–1623, Italian ecclesiastic: pope 1621–23. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Gregory XIV Gregory XVI Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language