As used in this act:

    (a) "Public employer" means a county, township, village, city, authority, school district, or other political subdivision of this state and includes any entity jointly created by 2 or more public employers.

    (b) "School district" means a school district, local act school district, or intermediate school district as those terms are defined in the revised school code, 1976 PA 451, MCL 380.1 to 380.1852, or a public school academy established under the revised school code, 1976 PA 451, MCL 380.1 to 380.1852.