/ Dictionary / Index L life sentence: Meaning and Definition of Find definitions for: life' sen'tence Pronunciation: [key] a sentence condemning a convicted felon to spend the rest of his or her life in prison. Cf. death sentence. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. life science life signs Related Content Daily Word Quiz: cur Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language