Meaning of “professionalism” in the English Dictionary. See all translations. uk ​ /prəˈfeʃ.ən.əl.ɪ.zəm/ us ​ /prəˈfeʃ.ən.əl.ɪ.zəm/. › the combination of all the qualities that are connected with trained and skilled people: He praised her professionalism and dynamism.