49 CFR 593.4 - Definitions.
All terms in this part that are defined in section 102 of the National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1391) are used as defined therein.
Administrator means the Administrator of the National Highway Traffic Safety Administration.
Model year means the year used by a manufacturer to designate a discrete vehicle model irrespective of the calendar year in which the vehicle was actually produced, or the model year as designated by the vehicle's country of origin, or, if neither the manufacturer nor the country of origin has made such a designation, the calendar year (i.e., January 1 through December 31) in which manufacturing operations are completed on the vehicle at its place of main assembly.
NHTSA means the National Highway Traffic Safety Administration.