(1) “Airport” means any area of land or water designed and set aside for the landing and taking-off of aircraft and utilized or to be utilized in the interest of the public for such purposes, including airports and airport facilities owned, operated or controlled by the United States Government for use by military aircraft. However, none of the provisions of this chapter shall be construed as granting to a political subdivision any power or authority that is prohibited by or that is in conflict with any law of the United States or any rule or regulation of any department, board, commission or agency of the United States.

(2) “Airport hazard” means any structure or tree or use of land which obstructs the airspace required for the flight of aircraft in landing or taking-off at any airport or is otherwise hazardous to such landing or taking-off of aircraft.

(3) “Airport hazard area” means any area of land or water upon which an airport hazard might be established if not prevented as provided in this chapter.

(4) “Political subdivision” means any municipality, city, town, village or county.

(5) “Person” means any individual, firm, copartnership, corporation, company, association, joint-stock association, or body politic, and includes any trustee, receiver, assignee or other similar representative thereof.

(6) “Structure” means any object constructed or installed by man, including but without limitation, buildings, towers, smokestacks and overhead transmission lines.

(7) “Tree” means any object of natural growth.