<p><strong>Noun</strong></p><ul><li>A state or government having a king or queen as its head.</li><li>Anything conceived as constituting a realm or sphere of independent action or control: the kingdom of thought.</li><li>Synonyms: domain, empire, dominion.</li><li>A realm or province of nature, especially one of the three broad divisions of natural objects: the animal, vegetable, and mineral kingdoms.</li><li>Biology: a taxonomic category of the second highest rank, just below domain: in a traditional five-kingdom classification scheme, separate kingdoms are assigned to animals (Animalia), plants (Plantae), fungi (Fungi), protozoa and eukaryotic algae (Protista), and bacteria (Monera).</li><li>The spiritual sovereignty of God or Christ.</li><li>The domain over which the spiritual sovereignty of God or Christ extends, whether in heaven or on earth.</li></ul>