Word.ws English Dictionary

functors

functors is the plural of functor.

Meaning of functor

Noun

functor (plural functors)

  1. A function word.
  2. (object-oriented programming) A function object.
  3. 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.
    • In the category of categories #92;mathbf#123;Cat#125; the objects are categories and the morphisms are functors.
  4. (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.

Phrases with functors

Questions about functors

What is functors the plural of?
Functors is the plural of functor.

Words near functors in the dictionary

  1. functor category
  2. functorial
  3. functorialities
  4. functoriality
  5. functorially
  6. functors
  7. functs
  8. functus
  9. functus officio
  10. fund
  11. fund house

Source and license

Adapted from Wiktionary: functors (page history and authors); functor (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “functors.” Word.ws, https://word.ws/functors. Based on Wiktionary, CC BY-SA 4.0.