n. The power or authority of a king; regal dominion; supreme rule.n. The state of being a king; kinghood; kingship.n. The territory or country subject to a king; the dominion of a king or monarch (see king, 1); in general, a domain; country.n. Anything conceived as constituting a realm or sphere of independent action or control: as, the kingdom of thought.n. In the New Testament, with the definite article, usually in fuller phrase the kingdom of God, or the kingdom of heaven, the spiritual reign of God as supreme king, and over subjects loyally accepting it: generally conceived as founded by the Messiah, and therefore a Messianic kingdom.n. In natural history, one of the three great divisions in which natural objects are ranked in classification—namely, the animal, vegetable, and mineral kingdoms