1.  domain(n = noun.state) area, arena, field, orbit, sphere - 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"
is a kind of environment
has particulars: distaff, front, kingdom, land, realm, lap, political arena, political sphere, preserve, province, responsibility

2.  domain(n = noun.location) demesne, land - territory over which rule or control is exercised; "his domain extended into Europe"; "he made it the law of the land"
is a kind of region
is a part of country, land, state
has particulars: archduchy, barony, duchy, dukedom, earldom, emirate, empire, imperium, fiefdom, grand duchy, viscounty, khanate, kingdom, realm, princedom, principality, sheikdom, sheikhdom, suzerainty

3.  domain(n = noun.group) domain of a function - (mathematics) the set of values of the independent variable for which a function is defined;
is a kind of set

4.  domain(n = noun.group) world - people in general; especially a distinctive group of people with some shared interest; "the Western world"
is a kind of class, social class, socio-economic class, stratum
has particulars: academe, academia, grub street

5.  domain(n = noun.cognition) knowledge base, knowledge domain - the content of a particular field of knowledge;
is a kind of cognitive content, content, mental object
has particulars: bailiwick, discipline, field, field of study, study, subject, subject area, subject field, realm, region, scientific knowledge

domain, n.
1 an area under one rule; a realm.
2 an estate or lands under one control.
3 a sphere of control or influence.
4 Math. the set of possible values of an independent variable.
5 Physics a discrete region of magnetism in ferromagnetic material.

Derivative:
domanial adj.

Etymology:
ME f. F domaine, OF demeine DEMESNE, assoc. with L dominus lord

N  class, division, category, categorema, head, order, section, department, subdepartment, province, domain, kind, sort, genus, species, variety, family, order, kingdom, race, tribe, caste, sept, clan, breed, type, subtype, kit, sect, set, subset, assortment, feather, kidney, suit, range, gender, sex, kin, manner, description, denomination, designation, rubric, character, stamp predicament, indication, particularization, selection, specification, similarity.

N  government, legal authority, soveriegn, sovereign authority, authority, master, direction, national government, nation, state, country, nation- state, dominion, republic, empire, union, democratic republic, kingdom, principality, state government, state, shire, province, county, canton, territory, duchy, archduchy, archdukedom, woiwodshaft, commonwealth, region, property, county, parish city, domain, tract, arrondissement, mofussil, commune, wappentake, hundred, riding, lathe, garth, soke, tithing, ward, precinct, bailiwick, command, empire, sway, rule, dominion, domination, sovereignty, supremacy, suzerainty, lordship, headship, chiefdom, seigniory, seigniority, rule, sway, command, control, administer, govern, lead, preside over, reign, possess the throne, be seated on the throne, occupy the throne, sway the scepter, wield the scepter, wear the crown, state, realm, body politic, posse comitatus, judicature, cabinet, seat of government, seat of authority, headquarters, accession, installation, politics, reign, regime, dynasty, directorship, dictatorship, protectorate, protectorship, caliphate, pashalic, electorate, presidency, presidentship, administration, proconsul, consulship, prefecture, seneschalship, magistrature, magistracy, monarchy, kinghood, kingship, royalty, regality, aristarchy, aristocracy, oligarchy, democracy, theocracy, demagogy, commonwealth, dominion, heteronomy, republic, republicanism, socialism, collectivism, mob law, mobocracy, ochlocracy, vox populi, imperium in imperio, bureaucracy, beadledom, bumbledom, stratocracy, military power, military government, junta, feodality, feudal system, feudalism, thearchy, theocracy, dinarchy, duarchy, triarchy, heterarchy, duumvirate, triumvirate, autocracy, autonomy, limited monarchy, constitutional government, constitutional monarchy, home rule, representative government, monocracy, pantisocracy, gynarchy, gynocracy, gynaeocracy, petticoat government, legislature, judiciary, administration, office of the president, office of the prime minister, cabinet, senate, house of representatives, parliament, council, courts, supreme court, state, interior, labor, health and human services, defense, education, agriculture, justice, commerce, treasury, Federal Bureau of Investigation, FBI, Central Intelligence Agency, CIA, National Institutes of Health, NIH, Postal Service, Post Office, Federal Aviation Administration, FAA, president, vice president, cabinet member, prime minister, minister, senator, representatative, president pro tem, speaker of the house, department head, section head, section chief, federal judge, justice, justice of the supreme court, chief justice, treasurer, secretary of the treasury, director of the FBI, governor, state cabinet member, state senator, assemblyman, assemblywoman, regal, sovereign, governing, royal, royalist, monarchical, kingly, imperial, imperiatorial, princely, feudal, aristocratic, autocratic, oligarchic, republican, dynastic, ruling, regnant, gubernatorial, imperious, authoritative, executive, administrative, clothed with authority, official, departmental, ex officio, imperative, peremptory, overruling, absolute, hegemonic, hegemonical, authorized, government, public, national, federal, his majesty's, her majesty's, state, county, city, N, a dog's obeyed in office, cada uno tiene su alguazil, le Roi le veut, regibus esse manus en nescio longas, regnant populi, the demigod Authority, the right divine of kings to govern wrong, uneasy lies the head that wears a crown.

N  property, possession, suum cuique, meum et tuum, ownership, proprietorship, lordship, seignority, empire, interest, stake, estate, right, title, claim, demand, holding, tenure, vested interest, contingent interest, beneficial interest, equitable interest, use, trust, benefit, legal estate, equitable estate, seizin, seisin, absolute interest, paramount estate, freehold, fee tail, fee simple, estate in fee, estate in tail, estate tail, estate in tail male, estate in tail female, estate in tail general, limitation, term, lease, settlement, strict settlement, particular estate, estate for life, estate for years, estate pur autre vie, remainder, reversion, expectancy, possibility, dower, dowry, jointure, appanage, inheritance, heritage, patrimony, alimony, legacy, Falcidian law, paternal estate, thirds, assets, belongings, means, resources, circumstances, wealth, money, what one is worth, what one will cut up for, estate and effects, landed property, landed real estate property, realty, land, lands, tenements, hereditaments, corporeal hereditaments, incorporeal hereditaments, acres, ground, acquest, messuage, toft, territory, state, kingdom, principality, realm, empire, protectorate, sphere of influence, manor, honor, domain, demesne, farm, plantation, hacienda, allodium, fief, fieff, feoff, feud, zemindary, dependency, arado, merestead, ranch, free lease-holds, copy lease-holds, folkland, chattels real, fixtures, plant, heirloom, easement, right of common, right of user, personal property, personal estate, personal effects, personalty, chattels, goods, effects, movables, stock, stock in trade, things, traps, rattletraps, paraphernalia, equipage, parcels, appurtenances, impedimenta, luggage, baggage, bag and baggage, pelf, cargo, lading, rent roll, income, maul and wedges, patent, copyright, chose in action, credit, debt, one's own, landed, predial, manorial, allodial, free lease-hold, copy lease-hold, feudal, feodal, to one's credit, to one's account, to the good, to one and his heirs for ever, to one and the heirs of his body, to one and his heirs and assigns, to one and his executors administrators and assign.

domain name, eminent domain, knowledge domain, public domain