/ Dictionary / Index L light adaptation: Meaning and Definition of Find definitions for: light' adapta"tion Pronunciation: [key] — Ophthalm. Ophthalm. the reflex adaptation of the eye to bright light, consisting of an increase in the number of functioning cones, accompanied by a decrease in the number of functioning rods (opposed to dark adaptation). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. light light air Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language