Wis. Stat. § 323.50: Definitions.

In this subchapter:

(1) “Interim successor” means a person designated under this subchapter, if the officer is unavailable as the result of enemy action, to exercise the powers and discharge the duties of an office until a successor is appointed or elected and qualified as provided by law or until the lawful incumbent is able to resume the exercise of the powers and discharge the duties of the office.

(2) “Office” includes all state and local offices, the powers and duties of which are defined by law, except the office of governor, and except those in the legislature and the judiciary.

(3) “Officer” means a person who holds an office.

(4) “Political subdivision” includes local units of government, special districts, authorities, and other public corporations and entities whether organized and existing under charter or general law.

(5) “Unavailable” means that a vacancy in office exists and there is no deputy authorized to exercise all of the powers and discharge the duties of the office, or that the lawful incumbent of the office and his or her duly authorized deputy are absent or unable to exercise the powers and discharge the duties of the office.