625 ILCS 5/1-171
Registration. The registration certificate or certificates, registration plates and registration stickers issued under the laws of this State pertaining to the registration of vehicles.
Registration Sticker or Stickers. A device or devices to be attached to a rear registration plate that will renew the registration and registration plate or plates for a pre-determined period not to exceed one registration year except as provided in subsection (1) of Section 3-414 of this Code. Should the Secretary of State determine it is advisable to require a registration sticker to be attached to a front registration plate, he may require such action and provide the necessary additional sticker. Such determination shall be publicly announced at least 30 days in advance of a new annual registration year.
"Registration" and "registration sticker or stickers" includes digital registration plates and digital registration stickers issued by the Secretary of State under Section 3-401.5.
625 ILCS 5/1-171