Definition of "Kingdom" :
noun: a basic group of natural objects
noun: the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia
noun: a monarchy with a king or queen as head of state
noun: the domain ruled by a king or queen
noun: a country with a king as head of state
noun: a domain in which something is dominant
"The untroubled kingdom of reason."