Definition of “kingdom”

noun

1. a territory, state, people, or community ruled or reigned over by a king or queen
2. any of the three groups into which natural objects may be divided: the animal, plant, and mineral kingdoms
3. biology any of the major categories into which living organisms of the domain any of the major categories into which living organisms of the domain Eukarya  are classified. Modern systems recognize four kingdoms: any of the major categories into which living organisms of the domain are classified. Modern systems recognize four kingdoms: Protoctista  (algae, protozoans, etc), any of the major categories into which living organisms of the domain are classified. Modern systems recognize four kingdoms: (algae, protozoans, etc), Fungi , any of the major categories into which living organisms of the domain are classified. Modern systems recognize four kingdoms: (algae, protozoans, etc), , Plantae , and any of the major categories into which living organisms of the domain are classified. Modern systems recognize four kingdoms: (algae, protozoans, etc), , , and Animalia See also domain (sense 12)
4. theology the eternal sovereignty of God
5. an area of activity, esp mental activity, considered as being the province of something specified  ⇒ the kingdom of the mind