commissioner

n. 1 person appointed by a commission to perform a specific task, e.g. The head of the london police etc. 2 member of a government commission. 3 representative of government in a district, department, etc. [medieval latin: related to *commission]

n. A person who has a commission or warrant to perform some office, or execute some business, for the government, corporation, or person employing him; as, a commissioner to take affidavits or to adjust claims.