/ Dictionary / Index S supersonic transport: Meaning and Definition of Find definitions for: su'person'ic trans'port Pronunciation: [key] a commercial jet airplane that can fly faster than the speed of sound. Abbr.: SST Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. supersonics superspeed Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language