noun A geographic area owned or controlled by a single person or organization.
The king ruled his domain harshly.
noun A field or sphere of activity, influence or expertise.
Dealing with complaints isn't really my domain: get in touch with customer services.
noun A group of related items, topics, or subjects.
noun The set of input (argument) values for which a function is defined. The set A; The subset of A consisting of elements a of A such that there exists an element b in B with (a,b) in R.
noun The set A; The subset of A consisting of elements a of A such that there exists an element b in B with (a,b) in R.
noun A ring with no zero divisors; that is, in which no product of nonzero elements is zero.
noun An open and connected set in some topology. For example, the interval (0,1) as a subset of the real numbers.
noun Any DNS domain name, particularly one which has been delegated and has become representative of the delegated domain name and its subdomains.