50 ILCS 460/10
As used in this Act, unless the context or usage clearly indicates otherwise:
"Governing body" means the legislative body, council, board, commission, trustees, or any other body by whatever name it is known having charge of the corporate affairs of a governmental unit.
"Governmental unit" means a county, township, municipality, municipal corporation, unit of local government, or a special district, by whatever name known, authorized by any special assessment law to make local improvements by special assessment.
"Special assessment bond" means any instrument evidencing the obligation to pay money authorized or issued by or on behalf of a governmental unit under a special assessment law or under this Act, being payable from assessments made under a special assessment law, and when applicable, as supplemented by this Act.
"Special assessment law" means any law of the State of Illinois authorizing governmental units to make local improvements payable wholly or in part by special assessment, and includes, without limitation, Division 2 of Article 9 of the Illinois Municipal Code, Division 5-32 of Article 5 of the Counties Code, Section 21 of the North Shore Water Reclamation District Act, Section 19 of the Sanitary District Act of 1917, Sections 22a.1 through 22a.55 of the Sanitary District Act of 1917, and Section 28 of the Sanitary District Act of 1936.
"Special assessment proceeding" means the proceeding by any governmental unit under a special assessment law to provide for the making of a specific local improvement by special assessment.
"Special assessment ordinance" means an ordinance, or when applicable a resolution, as provided for by any special assessment law by which the governing body institutes, calls for, or provides for the making of a local improvement to be paid by the imposition of a special assessment pursuant to such special assessment law.
"Supplemental Act Assessment Bonds" are those special assessment bonds issued under Section 100 of this Act.
"Voucher" means any voucher issued under a special assessment law for work done in connection with the making of a local improvement.
50 ILCS 460/10