§ 682. Definitions. As used herein, the following terms shall have the following meanings:
1. "Government" or "employer" shall mean any county, city, town, village, school district or other political subdivision in this state having one hundred or more full-time employees, except the city of New York.
2. "Public employee" or "employee" shall mean any person directly employed and compensated by a government, except persons employed in the legislative or judicial branch thereof.
3. "Supervisor" shall mean any person, regardless of title, who is assigned to exercise any level of supervisory responsibility over public employees.
4. "Grievance" shall mean any claimed violation, misinterpretation or inequitable application of the existing laws, rules, procedures, regulations, administrative orders or work rules of a government or a department or agency thereof, which relate to or involve employee health or safety, physical facilities, materials or equipment furnished to employees or supervision of employees; provided, however, that such term shall not include any matter involving an employee's rate of compensation, retirement benefits, disciplinary proceeding or any matter which is otherwise reviewable pursuant to law or any rule or regulation having the force and effect of law.