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Noun: dichotomy  dI'kó-tu-mee or di'kó-tu-mee
  1. Being twofold; a classification into two opposed parts or subclasses
    "the dichotomy between eastern and western culture";
    - duality
  2. (botany) branching repeatedly into two

Derived forms: dichotomies

Type of: categorisation [Brit], categorization, classification

Encyclopedia: Dichotomy