A geographic area owned or controlled by a single person or organization. • A field or sphere of activity, influence or expertise. • A group of related items, topics, or subjects. • 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. • A ring with no zero divisors; that is, in which no product of nonzero elements is zero. • An open and connected set in some topology. For example, the interval (0,1) as a subset of the real numbers. • Any DNS domain name, particularly one which has been delegated and has become representative of the delegated domain name and its subdomains. • A collection of DNS or DNS-like domain names consisting of a delegated domain name and all its subdomains. • A collection of information having to do with a domain, the computers named in the domain, and the network on which the computers named in the domain reside. • The collection of computers identified by a domain's domain names. • A small region of a magnetic material with a consistent magnetization direction. • Such a region used as a data storage element in a bubble memory. • A form of technical metadata that represent the type of a data item, its characteristics, name, and usage. • The highest rank in the classification of organisms, above kingdom; in the three-domain system, one of the taxa Bacteria, Archaea, or Eukaryota. • A folded section of a protein molecule that has a discrete function; the equivalent section of a chromosome. • An area of more or less uniform mineralization.