The term "administrative decision" is defined as in Section 3-101 of the Code of Civil Procedure.
70 ILCS 2605/4.37
The provisions of the Administrative Review Law, and all amendments and modifications thereof, and the rules adopted pursuant thereto, shall apply to and govern all proceedings for the judicial review of final administrative decisions of the civil service commission hereunder
P.A. 82-783.
Official source: Illinois General Assembly. Reproduced from public-domain Illinois statutes; confirm against the official source for the current text. Not legal advice.