/ Thesaurus / F Synonyms of filtration Find synonyms for: Noun1. filtration, natural process, natural action, action, activityusage: the process whereby fluids pass through a filter or a filtering medium2. filtration, changeusage: the act of changing a fluid by passing it through a filterWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: grimace Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language