As used in this Act:
"Adverse employment action" means an action that a reasonable employee would find materially adverse. An action is materially adverse when it could dissuade a reasonable worker from disclosing or threatening to disclose information protected by Section 15 or from refusing under Section 20.
"Employer" means: an individual, sole proprietorship, partnership, firm, corporation, association, and any other entity that has one or more employees in this State, including a political subdivision of the State; a unit of local government; a school district, combination of school districts, or governing body of a joint agreement of any type formed by two or more school districts; a community college district, State college or university, or any State agency whose major function is providing educational services; any authority including a department, division, bureau, board, commission, or other agency of these entities; and any person acting within the scope of his or her authority, express or implied, on behalf of those entities in dealing with its employees .
"Employee" means any individual permitted to work by an employer unless:
"Employee" also includes, but is not limited to, a licensed physician who practices his or her profession, in whole or in part, at a hospital, nursing home, clinic, or any medical facility that is a health care facility funded, in whole or in part, by the State.
"Public body" means any of the following: the State; any officer, board, political subdivision, or commission of the State; any institution supported in whole or in part by public funds; units of local government; and school districts.
"Retaliatory action" means an adverse employment action or the threat of an adverse employment action by an employer or his or her agent to penalize or any non-employment action that would dissuade a reasonable worker from disclosing information under this Act. "Retaliatory action" includes, but is not limited to:
"Retaliatory action" does not include:
"Supervisor" means any individual who has the authority to direct and control the work performance of the affected employee; or any individual who has managerial authority to take corrective action regarding a violation of the law, rule, or regulation disclosed by an employee in accordance with Section 15.
740 ILCS 174/5