/ Thesaurus / E Synonyms of exfiltration operation Find synonyms for: Noun1. exfiltration operation, clandestine operationusage: a clandestine rescue operation to bring a defector or refugee or an operative and family out of dangerWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language