"domain" in the noun sense
1. sphere, domain, area, orbit, field, arena
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"
2. domain, demesne, land
territory over which rule or control is exercised
"his domain extended into Europe"
"he made it the law of the land"
3. domain, domain of a function
mathematics) the set of values of the independent variable for which a function is defined
4. world, domain
people in general especially a distinctive group of people with some shared interest
"the Western world"
5. knowledge domain, knowledge base, domain
the content of a particular field of knowledge
Source: WordNet® (An amazing lexical database of English)
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