When used in this Article:
"Authority" means DuPage County Metropolitan Exposition, Auditorium and Office Building Authority.
"Board" means the governing and administrative body of the DuPage County Metropolitan Exposition, Auditorium and Office Building Authority.
"Metropolitan area" means all that territory in the State of Illinois lying within DuPage County, except for those portions lying within municipalities which have a civic center authority within the corporate limits of such municipalities, and except for those portions within the metropolitan area of the Illinois-Michigan Canal National Heritage Corridor Civic Center Authority.
70 ILCS 200/80-5