domain
1. The independent variable used to express a function.
Note: Examples of domains are time, frequency, and space.
2. In distributed networks, all the hardware and software under the control of a specified set of one or more host processors. [From Weik ’89]
3. [A] unique context (e.g., access control parameters) in which a program is operating; in effect, the set of objects a subject has the privilege to access. [INFOSEC-99]
4. The set of objects that a subject has the ability to access [TCSEC].