Noun
direct system (plural direct systems)
(algebra) A set of algebraic structures (which are part of a concrete category; e.g., modules) and a set of morphisms between them (e.g., module homomorphisms) which all together form a small category which is the image of a covariant functor whose domain is a directed poset.
It’s the latest step in Valve’s continuing battle against so-called “,” or developers who abuse the Steam Direct system in order to cut a profit on cheap — and cheaply made — titles. Source: Internet