Commissioner /(?)/

Com·mis·sion·er

Commissioner

n.
  1. 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.
    To another address which requested that a commission might be sent to examine into the state of things in Ireland, William returned a gracious answer, and desired the Commons to name the commissioners.
  2. An officer having charge of some department or bureau of the public service.
    Herbert was first commissioner of the Admiralty.
    The commissioner of patents, the commissioner of the land office, the commissioner of Indian affairs, are subordinates of the secretary of the interior.
    — Bartlett.

Phrases & Compounds
Commissioner of deeds
an officer having authority to take affidavits, depositions, acknowledgment of deeds, etc., for use in the State by which he is appointed.
County commissioners
certain administrative officers in some of the States, invested by local laws with various powers in reference to the roads, courthouses, financial matters, etc., of the county.