/ Dictionary / Index L luminous intensity: Meaning and Definition of Find definitions for: lu'minous inten'sity Pronunciation: [key] — Optics. Optics. the luminous flux in lumens emitted per unit solid angle by a light source, measured in candles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. luminous flux density luminous paint Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language