For the purposes of this title, the following words and phrases shall have the following meanings ascribed to them respectively.
ACT. The taking of action or a failure or omission to take action.
(720 ILCS 5/2-2)
ANOTHER. A person or persons other than the offender.
(720 ILCS 5/2-3)
CONDUCT. An act or a series of acts, and the accompanying mental state.
(720 ILCS 5/2-4)
OFFENSE. A violation of a penal statute of this city or state.
(720 ILCS 5/2-12)