ˈkɪŋdəm ɹɛlm a basic group of natural objects the highest taxonomic group into which organisms are grouped; one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia a monarchy with a king or queen as head of state the domain ruled by a king or queen a country with a king as head of state a domain in which something is dominant the untroubled kingdom of reason a land of make-believe the rise of the realm of cotton in the south