habitat

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The area or environment where an organism or ecological community normally lives or occurs: a marine habitat.
2. n. The place where a person or thing is most likely to be found.
3. n. A structure that affords a controlled environment for living in extremely inhospitable locations, such as an underwater research laboratory.

Century Dictionary and Cyclopedia

1. n. It lives or dwells: a Latin word beginning (in New Latin) that part of the description of an animal or a plant which mentions its locality: as, habitat in America septentrionali (it lives or grows in North America). Such statements are usually abbreviated, as Hab. Am. Sept.
2. n. n. In natural history, the area or region where an animal or a plant naturally lives or grows; by extension, place of abode in general; habitation. The complete habitat of a species is its geographical range. Applied, as it commonly is, to an individual or a specimen, it is generally distinguished in botany from the station, which refers to the physical conditions surrounding the plant, such as soil, exposure, and elevation. See station.

Wiktionary

1. n. biology A specific place or natural conditions in which a plant or animal lives.

GNU Webster's 1913

1. n. (Biol.) The natural abode, locality or region of an animal or plant.
2. n. Place where anything is commonly found.

WordNet 3.0

1. n. the type of environment in which an organism or group normally lives or occurs