verb (used with object), i·on·ized, i·on·iz·ing.

  1. to separate or change into ions.
  2. to produce ions in.

verb (used without object), i·on·ized, i·on·iz·ing.

  1. to become changed into the form of ions, as by dissolving.


  1. to change or become changed into ions

v.1896, from ion + -ize. Related: Ionized; ionizing. v.

  1. To dissociate atoms or molecules into electrically charged atoms or radicals.

  1. To give an atom or group of atoms a net electric charge by adding or removing one or more electrons.
  2. To form ions in a substance. Lightning ionizes air, for example.
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