com·mis·sion·er 
(kə-mĭshə-nər)
(kə-mĭshə-nər)n. Abbr. Com. or Comr.
1. A member of a commission.
2. A person authorized by a commission to perform certain duties.
3. A governmental official in charge of a department: a police commissioner.
4. Sports An official selected by an athletic association or league to exercise administrative or regulatory powers over it: a baseball commissioner.
com·mission·er·ship′ n.