domain

n. field; sovereignty, autonomy; division of the Internet according to country and type of organization (Computers)

Domain has several meanings:Generalsome kind of territory, such as (for example) a demesne or a realmsynonymous with a metaphorical field, e.g. "the domain of computer science"atomic domain - a domain whose elements are classified as indivisible unitsa field of studypublic domain, a body of works and knowledge without proprietary interesteminent domain, the  power of government to confiscate private property for public use
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Noun
1. 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"
(synonym) sphere, area, orbit, field, arena
(hypernym) environment
(hyponym) distaff
2. territory over which rule or control is exercised; "his domain extended into Europe"; "he made it the law of the land"
(synonym) demesne, land
(hypernym) region
(hyponym) archduchy
(part-holonym) country, state, land
3. the set of values of the independent variable for which a function is defined
(hypernym) set
4. people in general; especially a distinctive group of people with some shared interest; "the Western world"
(synonym) world
(hypernym) class, social class, socio-economic class
(hyponym) academia, academe
5. a knowledge domain that you are interested in or are communicating about; "it was a limited domain of discourse"; "here we enter the region of opinion"; "the realm of the occult"
(synonym) region, realm
(hypernym) knowledge domain, knowledge base

n. domain

(n.)
The territory over which dominion or authority is exerted; the possessions of a sovereign or commonwealth, or the like. Also used figuratively.
  

(n.)
Ownership of land; an estate or patrimony which one has in his own right; absolute proprietorship; paramount or sovereign ownership.
  

(n.)
Landed property; estate; especially, the land about the mansion house of a lord, and in his immediate occupancy; demesne.
  

(n.)
Dominion; empire; authority.