Category

The word category (from Greek
κατηγορια meaning
"assertion" or "accusation") has several meanings:

   * it is used informally to mean a class of things, as in "the category of
     all living things"
   * in philosophy:
        o Aristotle classified everything into 10 famous categories
        o others have tried the same, see categories of being
        o Kant uses the word for the preconceived notions we use to organize
          sense data
   * in mathematics:
        o a collection of mathematical objects of the same kind, together
          with the structure-preserving maps between them; as in "the
          category of all topological spaces and continuous maps". These are
          studied in category theory.
        o in topology, one distinguishes between sets of first and second
          category; see Baire space.

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terms with multiple meanings. You might want to add more meanings for this
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