In by Mark Goodman

A combination of interacting or interdependent components, assembled to carry out one or more functions

Merriam-Webster Online Dictionary
system (noun)
a regularly interacting or interdependent group of items forming a unified whole as - a number system
a) (1) a group of interacting bodies under the influence of related forces - a gravitational system
(2) an assemblage of substances that is in or tends to equilibrium - a thermodynamic system
b) (1) a group of body organs that together perform one or more vital functions - the digestive system
(2) the body considered as a functional unit
c) a group of related natural objects or forces - a river system
d) a group of devices or artificial objects or an organization forming a network especially for distributing something or serving a common purpose - a telephone system a heating system a highway system a computer system
e) a major division of rocks usually larger than a series and including all formed during a period or era
f) a form of social, economic, or political organization or practice - the capitalist system
an organized set of doctrines, ideas, or principles usually intended to explain the arrangement or working of a whole - systematic the Newtonian system of mechanics
a) an organized or established procedure - the touch system of typing
b) a manner of classifying, symbolizing, or schematizing - a taxonomic system the decimal system
harmonious arrangement or pattern - order bring system out of confusion Ellen Glasgow
an organized society or social situation regarded as stultifying or oppressive - establishment usually used with the method
System (Wikipedia)

A system is a regularly interacting or interdependent group of units forming an integrated whole. Every system is delineated by its spatial and temporal boundaries, surrounded and influenced by its environment, described by its structure and purpose and expressed in its functioning.

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