n.
1.a domain in which something is dominant
2.a country with a king as head of state
3.the domain ruled by a king or queen
4.a monarchy with a king or queen as head of state
5.one of seven biological categories: Monera or Protoctista or Plantae or Fungi or Animalia
6.a basic group of natural objects
Idiom of the Day
shut the door on (something)
to terminate/exclude/obstruct something
The bad behavior of the employees shut the door on any future parties at the company.