Divided into two mutually exclusive or contradictory parts; characterized by binary classification or branching. Often describes thinking, systems, or variables that present only two possible states or categories.
From Greek 'dichotomia' (division into two parts), combining 'dicha' (in two) and 'temnein' (to cut). Entered English via Medieval Latin in the 17th century, initially used in astronomy and botany before expanding to logic and social sciences.
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