/ Dictionary / Index R relative dispersion: Meaning and Definition of Find definitions for: rel'ative disper'sion Pronunciation: [key] — Optics. Optics. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. relative deprivation relative frequency Related Content Daily Word Quiz: jugular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language