Split or divided into two opposite or contrasting parts, especially as the British spelling of the past tense.
From dichotomize, which comes from Greek 'dichotomia' (division into two), from 'dicha' (in two) and 'tome' (cutting). The suffix '-ised' is the British spelling variant of '-ized', both meaning 'made into' or 'caused to become.'
The British spelling '-ised' ending actually reveals how language evolved differently after American independence—both spellings are correct, but they're a linguistic reminder of how the same language split into two main branches over centuries.
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