Environment

Environment is:

In mathematics for a topological concept of neighborhood, see Environment (mathematics)
In spatial planning for a concept of regional proximity
In thermodynamics for a medium for the exchange of matter or energy; see open system
In the operating system architecture for a software layer between applications and the operating system, execution environment; see runtime environment
In the use of computers for all the users available tools, work environment; see working environment
In information technology / system architecture for a platform on which an IT system is operated, for example, development, test or production environment; see system environment
In the network topology for organizational units, network neighborhood; see Network
In philosophy and the general sense of the word for frame of reference, Backstage, paradigm, background, connection, connections, Nexus.