/ Dictionary / Index E effluent: Meaning and Definition of Find definitions for: ef•fluent Pronunciation: (ef'l-unt), [key] — adj. flowing out or forth. —n. something that flows out or forth; outflow; effluence. a stream flowing out of a lake, reservoir, etc. sewage that has been treated in a septic tank or sewage treatment plant. sewage or other liquid waste that is discharged into a body of water, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: effluent (Thesaurus) effluence effluvium Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language