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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.
(in law) professional negligence that is the proximate cause of injury or harm to a patient, resulting from a lack of professional knowledge, experience, or skill that can reasonably be expected in others in the profession in similar circumstances or from a failure to exercise reasonable care or judgment in the application of professional knowledge ...