The standard spelling of 'ionize' in Australian, New Zealand, and Oxford-convention British English — to convert an atom or molecule into an ion by adding or removing electrons. The '-ise' suffix follows the Commonwealth and Oxford spelling conventions for verbs that use '-ize' in American English. Both are correct in their respective traditions; 'ionise' is the one you'd see in an Australian chemistry textbook.
Ultraviolet radiation can ionise the upper atmosphere and affect radio wave propagation.
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(Australia, New Zealand, Oxford) ionize.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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