The British spelling of the process of making something conventional or conforming to established customs and standards.
From 'conventional' + '-isation' (British suffix). The '-isation' suffix comes from Latin '-izare,' with the 's' spelling preferred in British English over the American 'z.'
The fact that British and American English differ in -ize vs -ise endings actually reflects 18th-century French influence on spelling conventions—so the spelling convention itself has a conventional history!
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