Definitions of domain:
- noun: a knowledge domain that you are interested in or are communicating about
Example: "It was a limited domain of discourse"
- noun: territory over which rule or control is exercised
Example: "His domain extended into Europe"
- noun: the set of values of the independent variable for which a function is defined
- noun: people in general; especially a distinctive group of people with some shared interest
- noun: a particular environment or walk of life