Definition of domain in English:



  • 1An area of territory owned or controlled by a particular ruler or government.

    ‘the French domains of the Plantagenets’
    • ‘Morning rose on the world, from the Pacific Ocean across the vast continent of Asia, across the ancient domains of Europe, and onto New York City.’
    • ‘The domains under her control included territories in both Burgundy and the Netherlands.’
    • ‘They are also similar in that military forces can gain advantages by controlling and exploiting these domains.’
    • ‘He had made Esfahan the capital of his domains and his grandson Malik-Shah was the ruler of that city from 1073.’
    • ‘These ancient domains of the old Burgundian empire seem to throw up a type of Frenchman more passionate in his devotion to a certain idea of France than any other.’
    • ‘The peripatetic household continued to gravitate towards the cities and towns of a ruler's domains, an urban environment providing the necessary infrastructures for court life.’
    • ‘The vast domain now had an area of nearly eleven and a half million square miles, and a population of more than a fifth of the people of the globe.’
    • ‘Or is the nuthouse the perfect front from which to control his gangland domain?’
    • ‘Despite his advanced age, he has plans to visit areas of his former domain where he is not well-liked.’
    realm, kingdom, empire, dominion, province, estate, territory, land, lands, dominions
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    1. 1.1 A specified sphere of activity or knowledge.
      ‘the country's isolation in the domain of sport’
      • ‘Sport, for the most part, is the domain of the young.’
      • ‘After dark, the street milieu is the domain of the shadowy.’
      • ‘In fact, this may be one domain in which a problem exists for which there is no useful cure: the genie might simply be out of the bottle.’
      • ‘You can look at the world as they would see it, and that's a very non-personal domain of awareness.’
      • ‘Inside our head there are various departments, compartments, areas and domains that contain information…’
      • ‘She calls for a new understanding of family, one that does not separate a public masculine world of paid employment from a private feminine domain of care.’
      • ‘The one area where there is some similarity between the two wars is the domain of public opinion.’
      • ‘But at any rate they are dealing with two different domains, two different areas, the epistemologic and the metaphysical.’
      • ‘He learned the technique, customarily the exclusive domain of women, from his mother during a visit home to Mali in 1987.’
      • ‘This is the domain of theology, cosmology and psychology.’
      • ‘I have never had the luxury of living and thinking in an exclusively theoretical cinematic domain.’
      • ‘Carol listened as the girls' shoes clomped down the stairs leading to the basement - Nicole's domain.’
      • ‘In this domain, as with so much modern technology, people are not just consumers; they're producers.’
      • ‘Finally, analyses testing the direct effects of individual stress domains on control and depressive symptoms, respectively, will be presented.’
      • ‘Here, I have a privilege of working with people who have expertise in their own domain areas for more than a decade.’
      • ‘All of this occurred essentially at once - no one domain drove the others.’
      • ‘‘We go into the domain of controls, locks, throws and take-downs,’ he says.’
      • ‘If hegemony is not consensual in this new domain, it won't long last.’
      • ‘On the one hand, Thompson does seem to have an encyclopedic knowledge of his subject domain, thanks in no small part to his willingness to talk to the media.’
      • ‘Moreover, particularly in developing countries, the use of personal computers had yet to be adapted to a legal domain.’
      field, area, arena, sphere, discipline, sector, section, region, province, world
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  • 2Computing
    A distinct subset of the Internet with addresses sharing a common suffix or under the control of a particular organization or individual.

    • ‘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.’
    • ‘If the people with those accounts didn't bother to change their e-mail address when the domain expired, you can collect their passwords.’
    • ‘Thus, identity indirectly controls the list of domains you may enter.’
    • ‘We noted at the time that despite hundreds of legal letters to domain holders, only one of these cases had proceeded to court, and that was settled.’
    • ‘Those that do still exist don't pay anything for their domains and have permanent control over them.’
  • 3Physics
    A discrete region of magnetism in ferromagnetic material.

    • ‘The larger the concentration of domains and ions, the more charges can be displaced and snap back.’
    • ‘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 will remain aligned until randomized by thermal agitation or by some other external force which can do work in rotating the domains within the material.’
    • ‘Ferromagnetic materials consist of tiny individual domains in which the magnetic moments of all the component atoms or molecules point in the same direction.’
    • ‘The magnetic domains are essentially tiny magnets, each with a north and south pole.’
  • 4Mathematics
    The set of possible values of the independent variable or variables of a function.

    • ‘In this case, this is not a problem, since the domain of the sine function is all real numbers.’
    • ‘In what follows, we will apply results about centroids of domains to unions of curves or line segments.’
    • ‘One of the first papers which he published after arriving in the United States was on the Euclidean algorithm in principal ideal domains.’
    • ‘Within each of these domains it is possible to conceptualize both static and dynamic variables.’
    • ‘Ten separate regression analyses were carried out, one regression analysis corresponding to each of the ten domains of the independent variables.’
  • 5Biochemistry
    A distinct region of a complex molecule or structure.

    • ‘In most of these proteins, the coiled-coil domains are flanked by protein domains that control the protein's distribution or specific function.’
    • ‘Can homologous proteins sharing the same fold differ significantly in the area of densely packed domains?’
    • ‘Structures of the third domain, complexed to different proteases, have been determined.’
    • ‘When Fe65 was bound to the binding domain of the tail, the researchers could see that there was another binding domain on the tail that could bind another protein.’
    • ‘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).