| Noun | 1. | domain - a particular environment or walk of life; "his social sphere is limited"; "it was a closed area of employment"; "he's out of my orbit"environment - the totality of surrounding conditions; "he longed for the comfortable environment of his living room" distaff - the sphere of work by women front - a sphere of activity involving effort; "the Japanese were active last week on the diplomatic front"; "they advertise on many different fronts" kingdom, realm, land - a domain in which something is dominant; "the untroubled kingdom of reason"; "a land of make-believe"; "the rise of the realm of cotton in the south" lap - an area of control or responsibility; "the job fell right in my lap" political arena, political sphere - a sphere of intense political activity preserve - a domain that seems to be specially reserved for someone; "medicine is no longer a male preserve" province, responsibility - the proper sphere or extent of your activities; "it was his province to take care of himself" |
| 2. | domain - territory over which rule or control is exercised; "his domain extended into Europe"; "he made it the law of the land" country, land, state - the territory occupied by a nation; "he returned to the land of his birth"; "he visited several European countries" archduchy - the domain controlled by an archduke or archduchess barony - the domain of a baron earldom - the domain controlled by an earl or count or countess emirate - the domain controlled by an emir empire, imperium - the domain ruled by an emperor or empress; the region over which imperial dominion is exercised fiefdom - the domain controlled by a feudal lord grand duchy - the domain controlled by a grand duke or grand duchess viscounty - the domain controlled by a viscount or viscountess khanate - the realm of a khan principality, princedom - territory ruled by a prince suzerainty - the domain of a suzerain region - a large indefinite location on the surface of the Earth; "penguins inhabit the polar regions" | |
| 3. | domain - (mathematics) the set of values of the independent variable for which a function is defined math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement set - (mathematics) an abstract collection of numbers or symbols; "the set of prime numbers is infinite" | |
| 4. | domain - people in general; especially a distinctive group of people with some shared interest; "the Western world" social class, socio-economic class, stratum, class - people having the same social, economic, or educational status; "the working class"; "an emerging professional class" Grub Street - the world of literary hacks | |
| 5. | domain - the content of a particular field of knowledge cognitive content, mental object, content - the sum or range of what has been perceived, discovered, or learned discipline, field of study, subject area, subject field, bailiwick, subject, field, study - a branch of knowledge; "in what discipline is his doctorate?"; "teachers should be well trained in their subject"; "anthropology is the study of human beings" realm, region - a knowledge domain that you are interested in or are communicating about; "it was a limited realm of discourse"; "here we enter the region of opinion"; "the realm of the occult" scientific knowledge - knowledge accumulated by systematic study and organized by general principles; "mathematics is the basis for much scientific knowledge" |