(765 ILCS 1036/5)
    Sec. 5. Definitions. In this Act:
    (a) A mark shall be deemed to be "abandoned" when either of the following occurs:
        (1) When its use has been discontinued with intent
    
not to resume that use. Intent not to resume may be inferred from circumstances. Nonuse for 2 consecutive years shall constitute prima facie evidence of abandonment.
        (2) When any course of conduct of the owner,
    
including acts of omission as well as commission, causes the mark to lose its significance as a mark.
    (b) "Applicant" means the person filing an application for registration of a mark under this Act, and the legal representatives, successors, or assigns of that person.
    (c) "Dilution" means the lessening of the capacity of a famous mark to identify and distinguish goods or services, regardless of the presence or absence of (1) competition between the owner of the famous mark and other parties, or (2) likelihood of confusion, mistake, or deception.
    (d) "Mark" includes any trademark or servicemark entitled to registration under this Act whether registered or not.
    (e) "Person" and any other word or term used to designate the applicant or other party entitled to benefit or privilege or rendered liable under the provisions of this Act means a natural person as well as a firm, partnership, corporation, union, association, or other organization capable of suing and being sued in a court of law.
    (f) "Registrant" means the person to whom the registration of a mark is issued under this Act, and the legal representatives, successors, or assigns of that person.
    (g) "Secretary" means the Secretary of State of Illinois or the designee of the Secretary charged with the administration of this Act.
    (h) "Servicemark" means any word, name, symbol, or device or any combination thereof used by a person, to identify and distinguish the services of one person, including a unique service, from the services of others, and to indicate the source of the services, even if that source is unknown. Titles, character names used by a person, and other distinctive features of radio or television programs may be registered as servicemarks notwithstanding that they, or the programs, may advertise the goods of the sponsor.
    (i) "Trademark" means any word, name, symbol, or device or any combination thereof used by a person to identify and distinguish the goods of the person, including a unique product, from those manufactured and sold by others, and to indicate the source of the goods, even if that source is unknown.
    (j) "Tradename" means any name used by a person to identify a business or vocation of the person.
    (k) "Use" means the bona fide use of a mark in the ordinary course of trade, and not made merely to reserve a right in a mark. For the purposes of this Act, a mark shall be deemed to be in use (1) on goods when it is placed in any manner on the goods or their containers or the displays associated therewith or on the tags or labels affixed thereto, or if the nature of the goods makes such placement impracticable, then on documents associated with the goods or their sale, and the goods are sold or transported in commerce in this State, and (2) on services when it is used or displayed in the sale or advertising of services and the services are rendered in this State.
(Source: P.A. 90-231, eff. 1-1-98.)