commonwealth, form of administration signifying government by the common consent of the people. To Locke and Hobbes and other 17th-century writers the term meant an organized political community similar to what is meant in the 20th cent. by the word state. Certain states of the United States are known as commonwealths (Massachusetts, Pennsylvania, Virginia, and Kentucky), and the federated states of Australia are known collectively as the Commonwealth of Australia. In the same collective sense, the now independent components of the former British Empire and Britain's remaining dependencies are described as the Commonwealth of Nations. The Commonwealth in English history was the government set up by the victorious army power following the English civil war and the execution (1649) of King Charles I. The Commonwealth was dominated from the outset by Oliver Cromwell, who by the Instrument of Government (1653) was made lord protector of the Commonwealth. The subsequent government is usually known as the Protectorate, though the Commonwealth formally continued until Restoration in 1660.
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