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The level of excellence or competence that is expected of a professional. The professionalism of the employee was unquestionable; for years he had worked diligently and with discretion, earning the accolades of his superiors and peers. The professionalism of the office manager in the doctor's office was a prime example of how all employees should treat a difficult or frustrating situation.
Definition of professional for English Language Learners : someone who does a job that requires special training, education, or skill : someone who is a member of a profession : someone who is paid to participate in a sport or activity