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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.
3 adj You use professional to describe people who do a particular thing to earn money rather than as a hobby., (Antonym: amateur) This has been my worst time for injuries since I started as a professional footballer... Professional is also a noun., n-count. He had been a professional since March 1985.