(1) In a LAN, a subnetwork made up of a group of clients and servers under the control of one security database. Dividing LANs into domains improves performance and security.
(2) In a communications network, all resources under the control of a single computer system.
(3) On the Internet, a registration category. See domain name and Internet domain name.
(4) In database management, all possible values contained in a particular field for every record in the file.
(5) A group of end points (phones or gateways) in a SIP telephony environment. See SIP.
(6) In magnetic storage devices, a group of molecules that makes up one bit.
(7) In a hierarchy, a named group that has control over the groups under it, which may be domains themselves.
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