The process or act of dividing something into two parts or interpreting it through a two-part framework.
From dualize (verb) + -ation (suffix creating nouns of action). Dualize itself comes from dual + -ize, a systematic formation that became more common in English from the 19th century onward.
Linguists noticed that some languages grammatically distinguish between two items (dual number) versus many items, suggesting our brains naturally dualize—we're wired to notice pairs before seeing groups of three or more.
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