Definition of professional noun from the Oxford Advanced American Dictionary

      

    professional

     noun
    noun
    NAmE//prəˈfɛʃənl//
     
     
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  1. 1a person who does a job that needs special training and a high level of education the terms that doctors and other health professionals use You need a professional to sort out your finances.
  2. 2(informal pro) a person who does a sport or other activity as a paid job rather than as a hobby a top golf professional opposite amateur
  3. 3(informal pro) a person who has a lot of skill and experience This was clearly a job for a real professional. opposite amateur
See the Oxford Advanced Learner's Dictionary entry: professional