domain

nouns

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"
area, arena, domain, field, orbit, sphere
territory over which rule or control is exercised
"his domain extended into Europe"; "he made it the law of the land"
demesne, domain, land
(mathematics) the set of values of the independent variable for which a function is defined
domain, domain of a function
people in general; especially a distinctive group of people with some shared interest
"the Western world"
domain, world
the content of a particular field of knowledge
domain, knowledge base, knowledge domain