/ Dictionary / Index S sound motion picture: Meaning and Definition of Find definitions for: sound' mo"tion pic"ture Pronunciation: [key] a motion picture with a soundtrack. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sound man sound pressure Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language