The things and conditions around a person or thing
I took up the time admiring my surroundings
milieu: the environmental condition
environment: the area in which something exists or lives; "the country--the flat agricultural surround"
In science and engineering, a system is the part of the universe that is being studied, while the environment is the remainder of the universe that lies outside the boundaries of the system. It is also known as the surroundings, and in thermodynamics, as the reservoir. ...
the area surrounding someone or something, together with the objects and circumstances in the vicinity; the environment or ambiance; All parts of the universe that are not within the thermodynamic system of interest
That part of an experimental set up, including the ambient air, which exchanges heat with, or does work on, the system.