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."

Primary Meanings of domain

a particular environment or walk of life
(mathematics) the set of values of the independent variable for which a function is defined
Full Definitions of domain

n a particular environment or walk of life

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

n territory over which rule or control is exercised

“his domain extended into Europe”
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

n people in general; especially a distinctive group of people with some shared interest

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

n the content of a particular field of knowledge

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
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
Type of:
cognitive content, content, mental object
the sum or range of what has been perceived, discovered, or learned

n (mathematics) the set of values of the independent variable for which a function is defined

domain of a function
Type of:
(mathematics) an abstract collection of numbers or symbols

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