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

A group of smaller bodies (such as planets or asteroids) that orbit one or more stars.

public address system

(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.

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

(computing) A system for computing that includes the physical computing unit itself and its peripherals. / (computing) Any system based around computer technology, such as a software package.

(Indo-European studies) A system which describes how certain Proto-Indo-European words are derived from one another.