"kingdoms" in the noun sense
1. kingdom, land, realm
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"
2. kingdom
a country with a king as head of state
3. kingdom, realm
the domain ruled by a king or queen
4. kingdom
a monarchy with a king or queen as head of state
5. kingdom
the highest taxonomic group into which organisms are grouped one of five biological categories: Monera or Protoctista or Plantae or Fungi or Animalia
6. kingdom
a basic group of natural objects
Source: WordNet® (An amazing lexical database of English)
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