/ Dictionary / Index P permittivity: Meaning and Definition of Find definitions for: per•mit•tiv•i•ty Pronunciation: (pûr"mi-tiv'i-tē), [key] — pl. -ties. the ratio of the flux density produced by an electric field in a given dielectric to the flux density produced by that field in a vacuum. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. permit permonosulfuric acid Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language