/ Dictionary / Index S supplementation: Meaning and Definition of Find definitions for: sup•ple•men•ta•tion Pronunciation: (sup"lu-men-tā'shun, -mun-), [key] — n. the act or process of supplementing. the state of being supplemented. something that supplements. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: supplementation (Thesaurus) supplementary story suppletion Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language