Divided or split into two opposite or contrasting parts, the American spelling of past tense.
From 'dichotomize' plus the regular past tense suffix '-ed.' American English standardized the '-ized' spelling in the 19th century, while British English retained '-ised.'
The fact that 'dichotomized' and 'dichotomised' both exist shows how the same Greek root grew into different branches of English—language itself has been dichotomized!
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