Definition of professional noun from the Oxford Advanced Learner's Dictionary

        

    professional

     noun
    noun
    BrE BrE//prəˈfeʃənl//
     
    ; NAmE NAmE//prəˈfeʃənl//
     
     
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  1. 1  a 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
  4. Extra examples She’s a consummate professional. The survey should be performed by an independent professional. This is the work of a real professional. a manageable read for busy professionals an actor revered by his fellow professionals highly educated and skilled professionals workshops led by industry professionals from around the US
See the Oxford Advanced American Dictionary entry: professional