Pronunciation: (king'dum),[key] —n. 1. a state or government having a king or queen as its head.
2. anything conceived as constituting a realm or sphere of independent action or control: the kingdom of thought. 3. a realm or province of nature, esp. one of the three broad divisions of natural objects: the animal, vegetable, and mineral kingdoms. 4. Biol.a taxonomic category of the highest rank, grouping together all forms of life having certain fundamental characteristics in common: in the five-kingdom classification scheme adopted by many biologists, separate kingdoms are assigned to animals (Animalia), plants (Plantae), fungi (Fungi), protozoa and eucaryotic algae (Protista), and bacteria and blue-green algae (Monera).
5. the spiritual sovereignty of God or Christ.
6. the domain over which the spiritual sovereignty of God or Christ extends, whether in heaven or on earth.