As used in this Act:
"Director" means the Director of Labor.
"Department" means the Department of Labor.
"Employee" means any individual permitted to work by an employer.
"Employer" means an individual, partnership, corporation, association, business, trust, person, or entity for whom employees are gainfully employed in Illinois and includes the State of Illinois, any state officer, department, or agency, any unit of local government, and any school district.
820 ILCS 112/5