British spelling of fluoridation; the process of adding fluoride to water supplies or dental products to improve dental health.
From 'fluoridise' (British spelling of 'fluoridate') plus the suffix '-tion', following British English conventions of using '-ise' instead of '-ize' for verbs.
This British spelling shows how the same public health intervention gets different names in different English-speaking countries—'fluoridation' in America and 'fluoridisation' in Britain and other Commonwealth nations.
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