/ Thesaurus / T Synonyms of to a great extent Find synonyms for: Adverb1. heavily, to a great extentusage: to a considerable degree; "he relied heavily on others' data"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language