/ Thesaurus / I Synonyms of in passing Find synonyms for: Adverb1. in passing, en passantusage: incidentally; in the course of doing something else; "he made this remark in passing"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language