/ Dictionary / Index S supplement: Meaning and Definition of Find definitions for: sup•ple•ment Pronunciation: (n.sup'lu-muntv.sup'lu-ment&sec), [key] — n. something added to complete a thing, supply a deficiency, or reinforce or extend a whole. a part added to a book, document, etc., to supply additional or later information, correct errors, or the like. a part, usually of special character, issued as an additional feature of a newspaper or other periodical. the quantity by which an angle or an arc falls short of 180° or a semicircle. —v.t. to complete, add to, or extend by a supplement. to form a supplement or addition to. to supply (a deficiency). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: supplement (Thesaurus) supplely supplemental Related Content Daily Word Quiz: ingenuity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language