/ Thesaurus / I Synonyms of initially Find synonyms for: Adverb1. initially, ab initiousage: at the beginning; "at first he didn't notice anything strange"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language