/ Dictionary / Index S supplemental: Meaning and Definition of Find definitions for: sup•ple•men•tal Pronunciation: (sup"lu-men'tl), [key] — adj. supplementary. nonscheduled (def. 2). (of a pleading, an affidavit, etc.) added to furnish what is lacking or missing. —n. anything that is supplemental: supplementals attached to the bill in committee. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: supplemental (Thesaurus) supplement supplemental plumage 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