Dictionary

domain

Etymology

From Middle English demayne, demain ("rule"), from Old French demeine, demaine, demeigne, domaine ("power"), (French domaine), from Latin dominium, from dominus ("master, proprietor, owner").

Pronunciation

(RP) IPA: /dəˈmeɪn/, /dəʊˈmeɪn/
(America) IPA: /doʊˈmeɪn/, /dəˈmeɪn/

Noun

domain (plural domains)

A geographic area owned or controlled by a single person or organization.
The king ruled his domain harshly.
A field or sphere of activity, influence or expertise.
Dealing with complaints isn't really my domain: get in touch with customer services.
His domain is English history.
A group of related items, topics, or subjects.
(mathematics, set theory) The set of input (argument) values for which a function is defined.
1. (more generally, of a binary relation R between A and B) 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.
(mathematics) A ring with no zero divisors; that is, in which no product of nonzero elements is zero.
Hyponym: integral domain
(mathematics, topology, analysis) An open and connected set in some topology. For example, the interval (0,1) as a subset of the real numbers.
(computing, Internet) Any DNS domain name, particularly one which has been delegated and has become representative of the delegated domain name and its subdomains.
- 2000, BIND 9 Administrator Reference Manual (9.3.2), Internet Software Consortium [https://web.archive.org/web/20060619063455/http://www.bind9.net/manual/bind/9.3.2/Bv9ARM.ch01.html]
  Every name in the DNS tree is a domain, even if it is terminal, that is, has no subdomains.
(computing, Internet) A collection of DNS or DNS-like domain names consisting of a delegated domain name and all its subdomains.
(computing) 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.
(computing) The collection of computers identified by a domain's domain names.
(physics) A small region of a magnetic material with a consistent magnetization direction.
(computing) Such a region used as a data storage element in a bubble memory.
(data processing) A form of technical metadata that represent the type of a data item, its characteristics, name, and usage.
(taxonomy) The highest rank in the classification of organisms, above kingdom; in the three-domain system, one of the taxa Bacteria, Archaea, or Eukaryota.
(biochemistry) A folded section of a protein molecule that has a discrete function; the equivalent section of a chromosome.
(geology) An area of more or less uniform mineralization.