<logic> 1. Of a function, the set of objects or sequences of objects that may serve as the arguments (inputs) of the function. See domain theory.
2. Of an interpretation of a formal language of predicate logic, the set of objects that may serve as the assigned referents of the constants of the language, the arguments of functions, and the arguments of predicates.
Cardinality of a domain: the cardinality of the set of objects comprising the domain.
[Glossary of First-Order Logic]
3. <networking> A group of computers whose hostnames share a common suffix, the "domain name". The last component of this is the top-level domain.
See administrative domain, Domain Name System, fully qualified domain name.
4. Distributed Operating Multi Access Interactive Network.
5. <programming> 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.
6. The subject or market in which a piece of software is designed to work.
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