/ Dictionary / Index R relative permittivity: Meaning and Definition of Find definitions for: rel'ative permittiv'ity Pronunciation: [key] permittivity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. relativeness relative pitch Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language