Meaning of “domain” in the English Dictionary

"domain" in British English

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domainnoun [ C ]

uk /dəˈmeɪn/ us /doʊˈmeɪn/

domain noun [ C ] (AREA)

C1 an area of interest or an area over which a person has control:

She treated the business as her private domain.
These documents are in the public domain (= available to everybody).

More examples

  • Are you still looking for some kind of job in the political domain?
  • I don't do any gardening - that's my wife's domain.
  • The report should never have been released into the public domain.
  • Now that she is a teenager, her bedroom is strictly her own personal domain.
  • You'd better ask Paul - electronics is not my domain, I'm afraid.

(Definition of “domain” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"domain" in American English

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domainnoun [ C ]

us /doʊˈmeɪn, də-/

domain noun [ C ] (INTEREST)

an area of interest or an area over which a person has control:

the domain of polymer science
public and private domains

domain noun [ C ] (GROUP OF VALUES)

mathematics a group of all the possible replacements for a variable (= letter or symbol that represents any set of values)

(Definition of “domain” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"domain" in Business English

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domainnoun [ C ]

uk /dəʊˈmeɪn/ us

a particular interest, activity, or type of knowledge

a business activity that is controlled by a particular industry, group of people, etc.:

Despite many advertising agencies having moved into their domain, specialised direct marketing agencies remain very competitive.
Currency trading is usually the domain of big banks.
Boardroom decisions are the exclusive domain of company directors.
the political/scientific domain

INTERNET a group of computers or websites that are organized by purpose, for example, to provide education or sell products:

The organization met to discuss adding new 'top-level' domains, the global designations such as .com and .gov.

(Definition of “domain” from the Cambridge Business English Dictionary © Cambridge University Press)