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Definition of commonwealth noun from the Oxford Advanced American Dictionary

     

    commonwealth

     noun
    noun
    NAmE//ˈkɑmənˌwɛlθ//
     
    [singular]
     
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  1. 1 the Commonwealth used in the official names of, and to refer to, some states (Kentucky, Massachusetts, Pennsylvania, and Virginia) the Commonwealth of Virginia The city and the Commonwealth have lost a great leader.
  2. 2 an independent area that is strongly connected to the U.S. Puerto Rico remains a U.S. commonwealth, not a state.
  3. 3Commonwealth used in the names of some groups of countries or states that have chosen to be politically linked with each other the Commonwealth of Independent States (CIS)
  4. 4 the Commonwealth an organization consisting of the United Kingdom and most of the countries that used to be part of the British Empire a member of the Commonwealth Commonwealth countries
See the Oxford Advanced Learner's Dictionary entry: commonwealth