WordWeb Online

1. A domain in which something is dominant
   "the rise of the realm of cotton in the south";
   - kingdom, land
    
2. The domain ruled by a king or queen
   - kingdom
    
3. A knowledge domain that you are interested in or are communicating about
   "it was a limited realm of discourse"; "the realm of the occult";
   - region

Derived forms: realms

Type of: area, arena, demesne, domain, field, knowledge base, knowledge domain, land, orbit, sphere

Encyclopedia: Realm