system

n. combination of related things or parts that form a complex whole; body of an animal or human considered as a whole; set of principles or ideas; method, procedure; organization, orderliness

System (from Latin systēma, in turn from Greek  systēma) is a set of entities, real or abstract, where each entity interacts with, or is related to, at least one other entity. There are natural and man-made (designed) systems. Natural systems may not have an apparent objective. Man-made systems normally have purpose, objectives. They are “designed to work as a coherent entity”. Any object which is not part of that system is part of the system environment. Systems usually interact also with some objects in their environment, by means of some of their components.
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n. system, method, procedure, structure

(n.)
The collection of staves which form a full score. See Score, n.
  

(n.)
Regular method or order; formal arrangement; plan; as, to have a system in one's business.
  

(n.)
One of the stellate or irregular clusters of intimately united zooids which are imbedded in, or scattered over, the surface of the common tissue of many compound ascidians.
  

(n.)
Hence, the whole scheme of created things regarded as forming one complete plan of whole; the universe.
  

(n.)
An assemblage of parts or organs, either in animal or plant, essential to the performance of some particular function or functions which as a rule are of greater complexity than those manifested by a single organ; as, the capillary system, the muscular system, the digestive system, etc.; hence, the whole body as a functional unity.
  

(n.)
An assemblage of objects arranged in regular subordination, or after some distinct method, usually logical or scientific; a complete whole of objects related by some common law, principle, or end; a complete exhibition of essential principles or facts, arranged in a rational dependence or connection; a regular union of principles or parts forming one entire thing; as, a system of philosophy; a system of government; a system of divinity; a system of botany or chemistry; a military system; the solar system.
  

Primarily, any means, group of interrelated methods functioning together, or institution that involves following fixed rules.