(biology) A group of organs that work together as a biological system to perform one or more functions.

(rail transport, historical) A block system in use on single-line railways, in which the stationmaster gives the driver a staff authorizing the driver to proceed over a given portion of track.

The system of buying and selling things via hire purchase.

(UK, historical) The practice, abolished in 1871, of paying money to be made an officer in the cavalry and infantry regiments of the English and later British Army, without having to wait for promotion.

(zoology) The system of connected water channels that is unique to sponges (Porifera). / (zoology, dated) The hydrostatic skeleton of certain marine gastropods.

The Copernican system of astronomy, erroneously attributed to Pythagoras.

a non-eliminating tournament format.

Synonym of star 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.

(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.