As used in this act:
a. "Pension fund" means the fund operating under the provisions of article 2 of chapter 66 of Title 18A of the New Jersey Statutes, as such fund applies to certain employees of the boards of education in school districts in counties of the first class.
b. "Retirement system" means the Public Employees' Retirement System of New Jersey as established under the provisions of P.L.1954, c. 84.