/ Thesaurus / L Synonyms of leo i Find synonyms for: Noun1. Leo I, St. Leo I, Leo the Greatusage: Italian pope from 440 to 461 who extended the authority of the papacy to the west and persuaded Attila not to attack Rome (440-461)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language