For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
   DECEPTION. Knowingly to:
      (1)   Create or confirm another’s impression which is false and which the offender does not believe to be true;
      (2)   Fail to correct a false impression which the offender previously has created or confirmed;
      (3)   Prevent another from acquiring information pertinent to the disposition of the property involved;
      (4)   Sell or otherwise transfer or encumber property, failing to disclose a lien, adverse claim
or other legal impediment to the enjoyment of the property, whether the impediment is or is not valid, or is or is not a matter of official record; or
      (5)   Promise performance which the offender does not intend to perform or knows will not be performed. Failure to perform standing alone is not evidence that the offender did not intend to perform.
(1981 Code, § 42.15, 15-4)
      (1)   In relation to property, to bring about a transfer of interest or possession, whether to the offender or to another; and
      (2)   In relation to labor or services, to secure the performance thereof.
(1981 Code, § 42.15, 15-7)
   OBTAINS CONTROL. The taking, carrying away or the sale, conveyance or transfer of title to or interest in or possession of property.
(1981 Code, § 42.15, 15-8)
   OWNER. A person, other than the offender, who has possession of or any other interest in the property involved, even though the interest or possession is unlawful and without whose consent the offender has no authority to exert control over the property.
(1981 Code, § 42.15, 15-2)
      (1)   Defeat all recovery of the property by the owner;
      (2)   Deprive the owner permanently of the beneficial use of the property;
      (3)   Retain the property with the intent to restore it to the owner only if the owner purchases or leases it back or pays a reward or other compensation for its return; or
      (4)   Sell, give, pledge or otherwise transfer any interest in the property or subject it to the claim of a person other than the owner.
(1981 Code, § 42.15, 15-3)
   PROPERTY. Anything of value. PROPERTY includes real estate, money, commercial instruments, admission or transportation tickets, written instruments representing or embodying rights concerning anything of value, labor or services or otherwise of value to the owner; things growing on, affixed to or found on land or part of or affixed to any building; electricity, gas and water; telecommunications services; birds, animals and fish, which ordinarily are kept in state of confinement; food and drink; samples, cultures, micro-organisms, specimens, records, recordings, documents, blueprints, drawings, maps and whole or partial copies, descriptions, photographs, computer programs or data, prototypes or models thereof or any other sections, materials, devices, substances and whole or partial copies, descriptions, photographs, prototypes or models thereof which constitute, represent, evidence, reflect or record a secret scientific, technical, merchandising, production or management information, design, process, procedure, formulas, invention or improvement.
(1981 Code, § 42.15, 15-1)
   STOLEN PROPERTY. Property over which control has been obtained by theft.
(1981 Code, § 42.15, 15-6)
   THREAT. A menace, however communicated, to:
      (1)   Inflict physical harm on the person threatened or any other person or on property;
      (2)   Subject any person to physical confinement or restraint;
      (3)   Commit any criminal offense;
      (4)   Accuse any person of a criminal offense;
      (5)   Expose any person to hatred, contempt or ridicule;
      (6)   Harm the credit or business repute of any person;
      (7)   Reveal any information sought to be concealed by the person threatened;
      (8)   Take action as an official against anyone or anything, withhold official action or cause the action or withholding;
      (9)   Bring about or continue a strike, boycott or other similar collective action if the property is not demanded or received for the benefit of the group which he or she purports to represent;
      (10)   Testify or provide information or withhold testimony or information with respect to another’s legal claim or defense; or
      (11)   Inflict any other harm which would not benefit the offender.
(1981 Code, § 42.15, 15-5)
   VALUE. The value of property consisting of any commercial instrument or any written instrument representing or embodying rights concerning anything of value, labor or services or otherwise of value to the owner shall be:
      (1)   The market-value of the instrument is not negotiable or is otherwise without a market value; and
      (2)   (a)   The ACTUAL VALUE of the instrument is not negotiable or is otherwise without a market value.
         (b)   For the purpose of establishing ACTUAL VALUE, the interest of any owner or owners entitled to part or all of the property represented by the instrument, by reason of the instrument, may be shown, even if another owner may be named in the complaint, information or indictment.
(ILCS Chapter 720, Act 5, §§ 15-1 through 15-9) (1981 Code, § 42.15, 15-9)