/ Dictionary / Index L Leo XII: Meaning and Definition of Find definitions for: Leo XII Pronunciation: [key] — (Annibale Francesco della Genga), 1760–1829, Italian ecclesiastic: pope 1823–29. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Leo XI Leo XIII Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language