(735 ILCS 5/2-613) (from Ch. 110, par. 2-613)
    Sec. 2-613. Separate counts and defenses. (a) Parties may plead as many causes of action, counterclaims, defenses, and matters in reply as they may have, and each shall be separately designated and numbered.
    (b) When a party is in doubt as to which of two or more statements of fact is true, he or she may, regardless of consistency, state them in the alternative or hypothetically in the same or different counts or defenses. A bad alternative does not affect a good one.
    (c) Defenses to jurisdiction of the subject matter or in abatement or in bar may be pleaded together, without waiving any defense so pleaded, but the court may order defenses to jurisdiction of the subject matter or in abatement to be tried first. An answer containing only defenses to jurisdiction of the subject matter or in abatement does not constitute an admission of the facts alleged in the complaint, counterclaim or third-party complaint.
    (d) The facts constituting any affirmative defense, such as payment, release, satisfaction, discharge, license, fraud, duress, estoppel, laches, statute of frauds, illegality, that the negligence of a complaining party contributed in whole or in part to the injury of which he complains, that an instrument or transaction is either void or voidable in point of law, or cannot be recovered upon by reason of any statute or by reason of nondelivery, want or failure of consideration in whole or in part, and any defense which by other affirmative matter seeks to avoid the legal effect of or defeat the cause of action set forth in the complaint, counterclaim, or third-party complaint, in whole or in part, and any ground or defense, whether affirmative or not, which, if not expressly stated in the pleading, would be likely to take the opposite party by surprise, must be plainly set forth in the answer or reply.
(Source: P.A. 84-624.)