Definition of professional adjective from the Oxford Advanced American Dictionary

        

    professional

     adjective
    adjective
    NAmE//prəˈfɛʃənl//
     
     
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  1. 1[only before noun] connected with a job that needs special training or skill, especially one that needs a high level of education professional qualifications/skills professional standards/practice an opportunity for professional development If it's a legal matter, you need to seek professional advice. You must not let your personal reactions interfere with your professional judgment.
  2. 2 (of people) having a job that needs special training and a high level of education Most of the people taking the course were professional women.
  3. 3showing that someone is well trained and extremely skilled synonym competent He dealt with the problem in a highly professional way. Many of the performers were very professional. opposite amateur
  4. 4suitable or appropriate for someone working in a particular profession professional conduct/misconduct opposite unprofessional
  5. 5(abbreviation pro) doing something as a paid job rather than as a hobby a professional golfer After he won the amateur championship he turned professional. opposite amateur
  6. 6 (abbreviation pro) (of sports) done as a paid job rather than as a hobby the world of professional football opposite amateur compare nonprofessional
See the Oxford Advanced Learner's Dictionary entry: professional