Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A subdivision that has common differentiating characteristics within a larger category.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. With respect to a given category, a more narrow category.
  • n. A subclass of a category which is itself a category, whose arrows are a restriction of the arrows of the parent category, and whose composition rule is a restriction of the parent category's

Etymologies

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