New Oxford American Dictionary
1) the surroundings or conditions in which a person, animal, or plant lives or operates.
•the setting or conditions in which a particular activity is carried on : a good learning environment.
•Computing the overall structure within which a user, computer, or program operates : a desktop development environment.
2) the natural world, as a whole or in a particular geographical area, esp. as affected by human activity.
1. The circumstances or conditions that surround one; surroundings.
2. The totality of circumstances surrounding an organism or group of organisms, especially:
a. The combination of external physical conditions that affect and influence the growth, development, and survival of organisms: "We shall never understand the natural environment until we see it as a living organism" (Paul Brooks).
b. The complex of social and cultural conditions affecting the nature of an individual or community.
The environment is a place where an organism lives in and all the things in it.