WordWeb Online

1. A particular environment or walk of life
   "his social domain is limited";
   - sphere, area, orbit, field, arena
    
2. Territory over which rule or control is exercised
   "his domain extended into Europe";
   - demesne, land
    
3. (mathematics) the set of values of the independent variable for which a function is defined
   - domain of a function
    
4. People in general; especially a distinctive group of people with some shared interest
   "the Western domain";
   - world
    
5. The content of a particular field of knowledge
   - knowledge domain, knowledge base

Derived forms: domains

Type of: class, cognitive content, content, environment, mental object, region, set, social class, socio-economic class, stratum

Part of: country, land, state

Encyclopedia: Domain, Manitoba