(anatomy) The system of organs within an organism which work together for the purpose of reproduction.

(historical) A penal method of the 19th century in which prisoners worked during the day in groups and were kept in solitary confinement at night, with enforced silence at all times.

(immunology) An aspect of the innate immune system that supplements the actions of the antibodies and phagocytic cells in clearing out pathogens from an organism

(algebra) A set of algebraic structures (which are part of a concrete category; e.g., groups) and a set of morphisms between them (e.g., group homomorphisms) which all together form a small category which is the image of a contravariant functor whose domain is a directed poset.

The system of measurements based on force, and independent of acceleration of gravity.

A refrigeration system that utilizes ammonia being absorbed by water, to create the cooling effect.

plural of absorption system

An arrangement whereby the main responsibility for welfare payments, especially unemployment benefits, is held by trade or labour unions rather than a government agency.

(mathematics) a set of equations required to be satisfied simultaneously or considered as a whole

plural of computer system