ionisation

Noun
  1. The condition of being dissociated into ions (as by heat or radiation or chemical reaction or electrical discharge) (synset 114601014)
    "the ionization of a gas"
  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 (synset 113524112)

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