1. Cs> In the theory of funCtions, the set of argument values for whiCh a funCtion is defined. See domain theory. 2. A group of Computers whose hostnames share a Common suffix, the "domain name". The last Component of this is the top-level domain. See Chefistrative domain, Domain Name System, {fully qualified domain name}. 3. Distributed Operating Multi ACCess InteraCtive Network. 4. A speCifiC phase of the software life CyCle in whiCh a developer works. Domains define developers' and users' areas of responsibility and the sCope of possible relationships between produCts. 5. The subjeCt or market in whiCh a pieCe of software is designed to work. (1997-12-26)