I am thinking about the very generic word category and was wondering:

Does the definition of the word category relate more to kind of a box (an item may only be in one and only one box at a time) or more to some kind of a tag (an object may have multiple tags)?

  • 1
    Think of guitar: two major categories are electric & acoustic; two others are classical (nylon strings) & steel string; two others are 6-string & 12-string; etc.
    – user21497
    Commented May 7, 2013 at 8:25
  • You're asking about the difference between disjoint categories and all categories. There's a whole branch of topology devoted to this. Commented May 7, 2013 at 15:40

1 Answer 1


A category is a group based on shared characteristics among and between the items included therein. Any object may be placed into any number of categories. For example, a black Labrador retriever is in these categories: dogs, black dogs, Labradors, retrievers, canines, mammals, animals, things with fur, things with four legs, etc.

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