/ Dictionary / Index S supp.: Meaning and Definition of Find definitions for: supp. Pronunciation: [key] supplement. supplementary. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. supine suppawn Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language