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Source: EPA
An environment is a complex of external factors. It acts on a system and determines its course and form of existence. An environment may be thought of as a superset, of which the given system is a subset. An environment may have one or more parameters, physical or otherwise. The environment of a given system must interact with that system in order for it to sustain and develop.
Generally, the environment or milieu of some object or action consists of the substances, circumstances, objects, or conditions by which it is surrounded or in which it occurs. (Although the two terms are usually synonyms, some sciences prefer the less common milieu to avoid confusion with the more wider-known meanings of environment in ecology, politics, and sociology).
Either word may be used with specialized meaning in various contexts.
Source: Wikipedia
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