As used in this chapter:

“Business” includes any activities engaged in by any person or organization or caused to be engaged in by the person or it for the object of gain, benefit, or advantage, either direct or indirect.

“Catalytic converter” means a device that is incorporated in a motor vehicle‘s exhaust system and contains a catalyst for converting pollutant gas emissions into less harmful emissions, regardless of whether the device has been removed from a motor vehicle’s exhaust system.

“Director of finance” means the director of finance of each county.

“Engaged in business”, “engaging in business”, and equivalent expressions mean commencing, conducting, or continuing in, holding oneself out by advertising, or any other means of being in a business, as well as liquidating a business when the liquidator thereof holds oneself out to be conducting the business. However, making or negotiating a casual or isolated sale or purchase is not engaging in business, but the sale or negotiation for the purchase by any person, during any period of one year, of more than three used motor vehicle parts or accessories (except as an incident to the established business of a licensed seller) shall be presumptive evidence that the person negotiating for, or effecting such sale or purchase is engaging in the business of selling or negotiating the purchase of used motor vehicle parts or accessories and that, if unlicensed pursuant to this chapter, the person negotiating for, or effecting such sale or purchase is violating § 289-2 of this chapter.

“Motor vehicle” means every vehicle which is self-propelled.

“Retail”, “sale at retail”, “retail sale”, and equivalent expressions, mean the act or attempted act of selling a used motor vehicle part or accessory to a person for use as a consumer.

“Sale”, “selling”, and equivalent expressions, mean the act or attempted act, either as principal or an agent or in any capacity whatsoever, of selling, bartering, exchanging, or otherwise disposing of, or negotiating, or offering, or attempting to negotiate, the sale, purchase, or exchange of, or any interest in, a used motor vehicle part or accessory.

“Used motor vehicle part or accessory” means a motor vehicle part or motor vehicle accessory which has been the subject of prior sale at retail, either individually or attached to a motor vehicle as a component part or accessory thereof.

“Wholesale”, “sale at wholesale”, “wholesale sale”, and equivalent expressions mean any sale other than a retail sale.