British spelling of equalize; to make equal, bring to the same level, or remove differences between things.
From equal + -ise (British suffix for forming verbs). The -ise suffix comes from Latin -izare and Greek -izein, adapted into Old French and then English. British English retained -ise while American English shifted to -ize.
The British 'equalise' versus American 'equalize' isn't just spelling preference—it represents a genuine fork in English language evolution, with British English preserving older Romance-influenced forms while American English adopted Greek patterns more aggressively.
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