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The Collaborative International Dictionary of English v.0.48:

ionize \i"on*ize\, v. t. [imp. & p. p. Ionized; p. pr. & vb. n. Ionizing.] (Physics, Chemistry) To convert (an atom or molecule) into ions, e. g. by dissolving in water, by reaction with acid or alkali, or by interaction with ionizing radiation. See ionization. [Webster 1913 Suppl. +PJC]