the British spelling of fractionization; the process of separating a mixture into its component fractions.
From fractionate + -isation (British suffix for -ization). The -isation ending is the standard British variant of -ization (American), used to form abstract nouns describing processes.
The British/American split in -isation/-ization creates amusing vocabulary debates, but both versions describe the same physical process—molecules don't care which side of the Atlantic we're on.
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