/ Dictionary / Index S SF: Meaning and Definition of Find definitions for: SF Pronunciation: [key] science fiction. sinking fund. sf Pronunciation: [key] science fiction. sforzando. s-f Pronunciation: [key] science fiction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Seymour Sfax Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language