/ Dictionary / Index I ionize: Meaning and Definition of Find definitions for: i•on•ize Pronunciation: (ī'u-nīz"), [key] — v., -ized, -iz•ing. —v.t. to separate or change into ions. to produce ions in. —v.i. to become changed into the form of ions, as by dissolving. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ionize (Thesaurus) ionization potential ionizing radiation Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language