/ Dictionary / Index L Leo I: Meaning and Definition of Find definitions for: Le•o I Pronunciation: (lē'ōIt.le'ô), [key] — Saint, (“Leo the Great”), a.d. c390–461, Italian ecclesiastic: pope 440–461. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Leo Leo II Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language