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From: WordNet (r) 2.0

 ionisation
      n 1: the condition of being dissociated into ions (as by heat or
           radiation or chemical reaction or electrical discharge);
           "the ionization of a gas" [syn: ionization]
      2: the process of ionizing; the formation of ions by separating
         atoms or molecules or radicals or by adding or subtracting
         electrons from atoms by strong electric fields in a gas
         [syn: ionization]