/ Dictionary / Index L L1: Meaning and Definition of Find definitions for: L1 Pronunciation: [key] — Ling. Ling. first language; native language. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. L, l L2 Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language