/ Dictionary / Index L lex: Meaning and Definition of Find definitions for: lex Pronunciation: (leks), [key] — pl. le•ges law. lex. Pronunciation: [key] lexical. lexicon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Lewisville Lexan Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language