/ Dictionary / Index A angular dispersion: Meaning and Definition of Find definitions for: an'gular disper'sion Pronunciation: [key] — Optics. Optics. a measure of the angular separation of light rays of different wavelength or color traversing a prism or diffraction grating, equal to the rate of change of the angle of deviation with respect to the change in wavelength. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. angular diameter angular displacement Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language