commissioner
Concise Oxford English Dictionary © 2008 Oxford University Press:
commissioner/kəˈmɪʃənə(r)/
▶noun a person appointed to a role on or by a commission.
■ a representative of the supreme authority in an area.
■ the head of the Metropolitan Police in London.
■ N. Amer. a person appointed to regulate a particular sport.
'commissioner' also found in these Oxford entries:

