functor
Category theory term: a structure-preserving map between categories. Often contrasted with ファンクタ, the loanword form.
See also: ファンクタ
In category theory, a functor is defined as a structure-preserving map between categories.
endofunctor
adjoint functors
Japanese coinage from 関 (relation) + 手 (agent/operator), likely calqued from English 'functor' (from 'function'). The exact derivation is uncertain.