Meaning of “ionize” in the English Dictionary

"ionize" in British English

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ionizeverb [ I or T ]

specialized UK usually ionise uk /ˈaɪ.ə.naɪz/ us /ˈaɪ.ə.naɪz/
ionized
adjective UK usually ionised uk /ˈaɪ.ə.naɪzd/ us /ˈaɪ.ə.naɪzd/

Nebulae contain very large amounts of ionized gas.
ionization
noun [ U ] UK usually ionisation uk /ˌaɪ.ə.naɪˈzeɪ.ʃən/ us /ˌaɪ.ə.nəˈzeɪ.ʃən/

Widespread ionization occurs readily in the earth's upper atmosphere.

(Definition of “ionize” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)