Usually means: Mapping between categories preserving structure.
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We found 18 dictionaries that define the word functor:

General (10 matching dictionaries)
  1. functor: Merriam-Webster
  2. functor: Oxford Learner's Dictionaries
  3. functor: American Heritage Dictionary of the English Language
  4. functor: Collins English Dictionary
  5. Functor, functor: Wordnik
  6. functor: Wiktionary
  7. functor: Infoplease Dictionary
  8. functor: Dictionary.com
  9. Functor (disambiguation), Functor (functional programming), Functor: Wikipedia, the Free Encyclopedia
  10. functor: TheFreeDictionary.com

Art (1 matching dictionary)
  1. Functor: Lexicon of Linguistics

Computing (2 matching dictionaries)
  1. functor: Free On-line Dictionary of Computing
  2. functor: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (3 matching dictionaries)
  1. Functor: Eric Weisstein's World of Mathematics
  2. -functor, functor: PlanetMath Encyclopedia
  3. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (1 matching dictionary)
  1. functor: Urban Dictionary

Definitions from Wiktionary (functor)

noun:  (grammar) A function word.
noun:  (object-oriented programming) A function object.
noun:  (category theory) A category homomorphism; a morphism from a source category to a target category which maps objects to objects and arrows to arrows (either covariantly or contravariantly), in such a way as to preserve morphism composition and identities.
noun:  (functional programming) A structure allowing a function to apply within a generic type, in a way that is conceptually similar to a functor in category theory.

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