commissioner
noun [ C ] uk/kəˈmɪʃ.ən.ər/ us/kəˈmɪʃ.ən.ɚ/
（政府部门或某一组织的）委员，专员，特派员，长官
an important official who has responsibility in a government department or another organization
the commissioner in charge of the police force 负责伦敦警察队伍的长官