Noun
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a basic group of natural objects
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the highest taxonomic group into which organisms are grouped
one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia
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a monarchy with a king or queen as head of state
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the domain ruled by a king or queen
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a country with a king as head of state
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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"