British spelling: to organize into departments; to divide an organization into separate functional divisions.
From department + -al + -ise (British spelling of -ize). The British variant of departmentalize following British English conventions.
The choice between -ise and -ize in British English is actually not random—most British verbs use -ise, but department-related words often use -ize because they're seen as technical/modern, showing how even spelling conventions reveal hidden assumptions about language.
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