/ Dictionary / Index E efflux: Meaning and Definition of Find definitions for: ef•flux Pronunciation: (ef'luks), [key] — n. outward flow, as of water. something that flows out; effluence. a passing or lapse of time. a passing away; expiration; ending. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: efflux (Thesaurus) effluvium effort Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language