(1) As used in 61-9-420 through 61-9-423 and this section, unless the context requires otherwise, the following definitions apply:
(a) "Booster seat" means a child safety restraint system that meets applicable federal motor vehicle safety standards and is designed to provide belt-positioning that elevates a child to be properly seated with a safety belt.
(b) "Child safety restraint system" means a device that:
(i) meets applicable federal motor vehicle safety standards; and
(ii) is appropriate to the age of the child being restrained, as provided in 61-9-420.
(c) (i) "Properly restrained" means fastened in a manner prescribed by the manufacturer of the child safety restraint system that permits the child safety restraint system to act as a body restraint.
(ii) The term does not mean a system in which the only body restraint is a safety belt of the type required by 61-9-409.
(d) "Secured with a safety belt" means restrained or secured by a seat belt that:
(i) meets applicable federal motor vehicle safety standards; and
(ii) is properly adjusted and fastened, including both the shoulder and lap straps, when equipped in the vehicle.