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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. 1the 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. 2an 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. 4the 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