/ Dictionary / Index L lx: Meaning and Definition of Find definitions for: lx Pronunciation: [key] — Symbol, Optics. lux; luces. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lx (Thesaurus) LWV LXX Related Content Daily Word Quiz: benevolent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language