40 ILCS 5/16-106.41: Tier 1 member.

"Tier 1 member": A member under this Article who first became a member or participant before January 1, 2011 under any reciprocal retirement system or pension fund established under this Code other than a retirement system or pension fund established under Article 2, 3, 4, 5, 6, or 18 of this Code.