/ Dictionary / Index S simple sentence: Meaning and Definition of Find definitions for: sim'ple sen'tence Pronunciation: [key] a sentence having only one clause, as I saw her the day before yesterday. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. simple protein Simple Simon Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language