As used in this part, unless the context otherwise requires:
(1) “Commercial purposes” means use in a trade or business;
(2) “Dealer” means an entity or person who: Is the operator of a retail station or other retail outlet and who delivers liquified gas into the fuel supply tanks of motor vehicles;
(3) Delivers liquified gas into a dispenser capable of fueling motor vehicles; or
(4) Dispenses compressed natural gas to the public;
(5) “Liquified gas” means all combustible gases that exist in the gaseous state at sixty degrees Fahrenheit (60°F) and at a pressure of fourteen and seven-tenths pounds per square inch (14.7 p.s.i.) absolute, but does not include gasoline or diesel fuel or compressed natural gas;
(6) “Motor vehicle” means a self-propelled vehicle licensed for highway use;
(7) “Passenger car” means a motor vehicle designed for carrying ten (10) or fewer passengers and used for the transportation of persons;
(8) “Taxable sales or deliveries” means the delivery in Tennessee of liquified gas or compressed natural gas into the fuel supply tank of a motor vehicle that does not have affixed a current user permit; and
(9) “User” means a person who operates a motor vehicle in this state that is propelled by liquified gas or compressed natural gas.