/ Dictionary / Index A aftereffect: Meaning and Definition of Find definitions for: af•ter•ef•fect Pronunciation: (af'tur-i-fekt", äf'-), [key] — n. a delayed effect; an effect that follows at some interval after the stimulus that produces it. a result appearing after the first effect due to an agent, usually a drug, has gone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: aftereffect (Thesaurus) after-dinner afterglow Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language