domain - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “domain”

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domain

noun [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)
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