/ Dictionary / Index P positive ion: Meaning and Definition of Find definitions for: pos'itive i'on Pronunciation: [key] — Physics, Chem. Physics,Chem. See under(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. positive feedback positive law 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