D defs.my
Entry 12 senses Webster, 1913

Domain

/dōm-ān'/ · Do·main · IPA /doʊˈmeɪn/
01 n. Dominion; empire; authority.
  1. 1.
    Dominion; empire; authority.
  2. 2.
    The territory over which dominion or authority is exerted; the possessions of a sovereign or commonwealth, or the like. Also used figuratively.
    “The domain of authentic history.” — E. Everett.
    “The domain over which the poetic spirit ranges.” — J. C. Shairp.
  3. 3.
    Landed property; estate; especially, the land about the mansion house of a lord, and in his immediate occupancy; demesne.
  4. 4.
    Ownership of land; an estate or patrimony which one has in his own right; absolute proprietorship; paramount or sovereign ownership.(Law)
  5. 5.
    the set of values which the independent variable of a function may take. Contrasted to range, which is the set of values taken by the dependent variable.(Math.)
  6. 6.
    a connected set of points, also called a region.(Math.) Also: region
  7. 7.
    a region within a ferromagnetic material, composed of a number of atoms whose magnetic poles are pointed in the same direction, and which may move together in a coordinated manner when disturbed, as by heating. The direction of polarity of adjacent domains may be different, but may be aligned by a strong external magnetic field.(Physics)
  8. 8.
    an address within the internet computer network, which may be a single computer, a network of computers, or one of a number of accounts on a multiuser computer. The domain specifies the location (host computer) to which communications on the internet are directed. Each domain has a corresponding 32-bit number usually represented by four numbers separated by periods, as 128.32.282.56. Each domain may also have an alphabetical name, usually composed of a name plus an extension separated by a period, as worldsoul.org; the alphabetical name is referred to as a domain name.(Computers)
  9. 9.
    the three-dimensional structure within an immunoglobulin which is formed by one of the homology regions of a heavy or light chain.(Immunology)
  10. 10.
    the field of knowledge, expertise, or interest of a person; as, he had a limited domain of discourse; I can't comment on that, it's outside my domain.
  11. 11.
    a particular environment or walk of life.
  12. 12.
    people in general; especially a distinctive group of people with some shared interest.
Phrases & compounds
Public domain — the territory belonging to a State or to the general government; public lands.
in the public domain — that superior dominion of the sovereign power over all the property within the state, including that previously granted by itself, which authorizes it to appropriate any part thereof to a necessary public use, reasonable compensation being made.
Syn. domain, realm, field, area. — Syn. -- sphere, domain, area, orbit, field, arena. — Syn. -- world, domain.