(a) As used in this Act “public corporations” mean any body corporate organized by or pursuant to the laws of this State to carry out a public governmental or proprietary function, including, without limitation of the foregoing, the state, any school district, park district, city, village, incorporated town, county, drainage or any other type of district, commission, authority, university, public community college or any combination thereof, acting through the corporate authorities thereof.
     (b) “Bonds” or “other evidences of indebtedness” mean any instrument providing for the payment of money executed by or on behalf of a public corporation or which the public corporation has assumed or agreed to pay, including, without limitation of the foregoing, bonds, notes, contracts, leases, certificates and tax anticipation warrants.