Definition of domain in English:


Line breaks: do¦main
Pronunciation: /də(ʊ)ˈmeɪn


  • 2 Computing A distinct subset of the Internet with addresses sharing a common suffix or under the control of a particular organization or individual.
    More example sentences
    • If the people with those accounts didn't bother to change their e-mail address when the domain expired, you can collect their passwords.
    • The process for deciding ownership of Internet domains is flawed, biased and in drastic need of reform, an expert in Internet and e-commerce law has concluded in a study released today.
    • Thus, identity indirectly controls the list of domains you may enter.
  • 3 Physics A discrete region of magnetism in ferromagnetic material.
    More example sentences
    • Ferromagnetic materials consist of tiny individual domains in which the magnetic moments of all the component atoms or molecules point in the same direction.
    • By altering the microstructure, we can create weak links between the ferromagnetic domains that should lead to new and interesting electronic networks.
    • The magnetic domains are essentially tiny magnets, each with a north and south pole.
  • 4 Mathematics The set of possible values of the independent variable or variables of a function.
    More example sentences
    • Ten separate regression analyses were carried out, one regression analysis corresponding to each of the ten domains of the independent variables.
    • In this case, this is not a problem, since the domain of the sine function is all real numbers.
    • One of the first papers which he published after arriving in the United States was on the Euclidean algorithm in principal ideal domains.
  • 5 Biochemistry A distinct region of a complex molecule or structure.
    More example sentences
    • Structures of the third domain, complexed to different proteases, have been determined.
    • In most of these proteins, the coiled-coil domains are flanked by protein domains that control the protein's distribution or specific function.
    • The study of chimeric MyHCs has previously implicated these loop domains in the control of the enzymatic and biophysical properties of the motor domain.


late Middle English (denoting heritable or landed property): from French domaine, alteration (by association with Latin dominus 'lord') of Old French demeine 'belonging to a lord' (see demesne).

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a small amount; a little