The British spelling of departmentalization; the process of organizing something into separate departments or divisions.
From department + -al (adjective suffix) + -ization (noun suffix forming abstract noun). British variant using -ise/-isation instead of American -ize/-ization.
British and American English split over this word's ending in the 1800s—departmentalisation vs. departmentalization—a perfect example of how two countries speaking 'the same language' quietly diverged on systematic word-formation rules.
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