If you have a place that's all your own, somewhere real or in cyberspace that has your name all over it — literally or figuratively — it's your domain. And if you have something you really excel at, that is your domain too. You own it.

A domain used to mean only land owned by wealthy people, such as lords in the 15th century, but modern usage is much wider, or has a broader domain in the English language. On the Internet, a domain is a space with a specific address, but a domain can also have a physical address, like a home. It can be a specialty, too, as in, "The main domain of the art school was sculpture," or "She was so good at math that algebra became her domain."

Definitions of domain
  1. noun
    a particular environment or walk of life
    synonyms: area, arena, field, orbit, sphere
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    the sphere of work by women
    a sphere of activity involving effort
    kingdom, land, realm
    a domain in which something is dominant
    an area of control or responsibility
    political arena, political sphere
    a sphere of intense political activity
    a domain that seems to be specially reserved for someone
    province, responsibility
    the proper sphere or extent of your activities
    lotus land, lotusland
    an idyllic realm of contentment and self-indulgence
    lap of the gods
    beyond human control or responsibility
    ecclesiastical province
    the district within the jurisdiction of an archbishop or a metropolitan or one of the territorial divisions of an ecclesiastical order
    type of:
    the totality of surrounding conditions
  2. noun
    territory over which rule or control is exercised
    “his domain extended into Europe”
    synonyms: demesne, land
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    the domain controlled by an archduke or archduchess
    the domain of a baron
    duchy, dukedom
    the domain controlled by a duke or duchess
    the domain controlled by an earl or count or countess
    the domain controlled by an emir
    empire, imperium
    the domain ruled by an emperor or empress; the region over which imperial dominion is exercised
    the domain controlled by a feudal lord
    grand duchy
    the domain controlled by a grand duke or grand duchess
    the domain controlled by a viscount or viscountess
    the realm of a khan
    kingdom, realm
    the domain ruled by a king or queen
    princedom, principality
    territory ruled by a prince
    sheikdom, sheikhdom
    the domain ruled by a sheik
    the domain of a suzerain
    type of:
    a large indefinite location on the surface of the Earth
  3. noun
    people in general; especially a distinctive group of people with some shared interest
    synonyms: world
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    academe, academia
    the academic world
    Grub Street
    the world of literary hacks
    type of:
    class, social class, socio-economic class, stratum
    people having the same social, economic, or educational status
  4. noun
    the content of a particular field of knowledge
    synonyms: knowledge base, knowledge domain
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    bailiwick, discipline, field, field of study, study, subject, subject area, subject field
    a branch of knowledge
    realm, region
    a knowledge domain that you are interested in or are communicating about
    scientific knowledge
    knowledge accumulated by systematic study and organized by general principles
    a systematic method or organized body of knowledge relating to some topic or field
    the study of the supernatural
    communication theory, communications
    the discipline that studies the principles of transmiting information and the methods by which it is delivered (as print or radio or television etc.)
    the principal field of study of a student at a university
    an undeveloped field of study; a topic inviting research and development
    the study or investigation of ancestry and family history
    the study of the relative growth of a part of an organism in relation to the growth of the whole
    the scientific study of documents and handwriting etc. especially to determine authorship or authenticity
    an informal word (abstracted from words with this ending) for some unidentified branch of knowledge
    science, scientific discipline
    a particular branch of scientific knowledge
    the discipline dealing with the principles of design and construction and ornamentation of fine buildings
    applied science, engineering, engineering science, technology
    the discipline dealing with the art or science of applying scientific knowledge to practical problems
    futuristics, futurology
    the study or prediction of future developments on the basis of existing conditions
    arts, humanistic discipline, humanities, liberal arts
    studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills)
    divinity, theology
    the rational and systematic study of religion and its influences and of the nature of religious truth
    military science
    the discipline dealing with the principles of warfare
    the study of methods of escaping (especially as a form of entertainment)
    the study of handwriting (especially as an indicator of the writer's character or disposition)
    the study of the supposed occult influence of numbers on human affairs
    the study of origins and first things
    the study of the origins and genealogy of the gods
    a branch of study or knowledge involving the observation, investigation, and discovery of general laws or truths that can be tested systematically
    the art or study of formal debate and argumentation
    type of:
    cognitive content, content, mental object
    the sum or range of what has been perceived, discovered, or learned
  5. noun
    (mathematics) the set of values of the independent variable for which a function is defined
    synonyms: domain of a function
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    type of:
    (mathematics) an abstract collection of numbers or symbols
  6. noun
    (biology) the taxonomic category above the kingdom; the three domains are Eukarya, Archaea, and Bacteria
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    type of:
    taxon, taxonomic category, taxonomic group
    animal or plant group having natural relations
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