/ Dictionary / Index L leading light: Meaning and Definition of Find definitions for: lead'ing light' Pronunciation: (lē'ding), [key] an important or influential person: a leading light of the community. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. leading lady leading man Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language