/ Dictionary / Index L LEP: Meaning and Definition of Find definitions for: LEP Pronunciation: [key] large electron-positron collider. limited English proficiency. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Leotine Lepanto Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language