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From The Collaborative International Dictionary of English v.0.48:
Kingdom \King"dom\, n. [AS. cyningd[=o]m. See 2d King, and -dom.] 1. The rank, quality, state, or attributes of a king; royal authority; sovereign power; rule; dominion; monarchy. [1913 Webster] Thy kingdom is an everlasting kingdom. --Ps. cxiv. 13. [1913 Webster] When Jehoram was risen up to the kingdom of his father, he strengthened himself. --2 Chron. xxi. 4. [1913 Webster] 2. The territory or country subject to a king or queen; the dominion of a monarch; the sphere in which one is king or has control. [1913 Webster] Unto the kingdom of perpetual night. --Shak. [1913 Webster] You're welcome, Most learned reverend sir, into our kingdom. --Shak. [1913 Webster] 3. An extensive scientific division distinguished by leading or ruling characteristics; a principal division; a department; as, the mineral kingdom. In modern biology, the division of life into five kingdoms is widely used for classification. "The animal and vegetable kingdoms." --Locke. [1913 Webster +PJC] Animal kingdom. See under Animal. Kingdom of God. (a) The universe. (b) That spiritual realm of which God is the acknowledged sovereign. (c) The authority or dominion of God. Mineral kingdom. See under Mineral. United Kingdom. See under United. Vegetable kingdom. See under Vegetable. Syn: Realm; empire; dominion; monarchy; sovereignty; domain. [1913 Webster]