/ Dictionary / Index S self-propulsion: Meaning and Definition of Find definitions for: self-pro•pul•sion Pronunciation: (self' pru-pul'shun, self"-), [key] — n. propulsion by a vehicle's own engine, motor, or the like. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. self-propelled self-protection Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language