/ Dictionary / Index S sci-fi: Meaning and Definition of Find definitions for: sci-fi Pronunciation: (sī'fī'), [key] — Informal. Informal. —adj. of or pertaining to science fiction: a writer of sci-fi books. —n. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. scientize scil. Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language