Webster's Revised Unabridged Dictionary · 1913

ionize

ionize , intransitive verb

1.
(Physics, Chemistry) to dissociate into ions, as by dissolution in water or another polar solvent.

ionize , transitive verb

(Physics, Chemistry) To convert (an atom or molecule) into ions, for example by dissolving in water, by reaction with acid or alkali, or by interaction with ionizing radiation. See ionization.