/ Dictionary / Index S super-duper: Meaning and Definition of Find definitions for: su•per-du•per Pronunciation: (s'pur-d'pur), [key] — adj. Informal. extremely good, powerful, large, etc.; very super; marvelous or colossal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. superdominant superego 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