cross classification

/krɔsˌklæsɪfɪˈkeɪʃən/
noun
  1. A system of organizing items into categories based on two or more criteria at the same time.
    • The library uses a cross-classification system by genre and author.
    • In biology, cross-classification helps group animals by habitat and diet.
    • The survey data was analyzed using cross-classification of age and income.
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