verb (used with object), ionized, ionizing.
to separate or change into ions.
to produce ions in.
verb (used without object), ionized, ionizing.
to become changed into the form of ions, as by dissolving.
Also, especially British, ionise.

1895–1900; ion + -ize

ionizable, adjective
ionization, noun
ionizer, noun
nonionized, adjective
nonionizing, adjective
self-ionization, noun
unionized, adjective
ununionized, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ionization or ionisation (ˌaɪənaɪˈzeɪʃən)
a.  the formation of ions as a result of a chemical reaction, high temperature, electrical discharge, particle collisions, or radiation
 b.  (as modifier): ionization temperature; ionization current
ionisation or ionisation

ionize or ionise (ˈaɪəˌnaɪz)
to change or become changed into ions
ionise or ionise
'ionizable or ionise
'ionisable or ionise

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

ionization i·on·i·za·tion (ī'ə-nĭ-zā'shən)

  1. The formation of or separation into ions by heat, electrical discharge, radiation, or chemical reaction; electrolytic dissociation.

  2. See iontophoresis.

ionize i·on·ize (ī'ə-nīz')
v. i·on·ized, i·on·iz·ing, i·on·iz·es
To dissociate atoms or molecules into electrically charged atoms or radicals.

i'on·iz'er n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
ionize   (ī'ə-nīz')  Pronunciation Key 
  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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
By determining when this transition took place, scientists can pin down the start date of the helium-ionization era.
And in the second place, when a current flows through gas, ionization occurs and charged particles are produced.
Ionization is the separation of electrons from molecules.
Ionization of the atmosphere and concomitant ozone depletion are unlikely to be important.
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