Motor carrier means a for-hire motor carrier or a private motor carrier. The term includes a motor carrier's agents, officers and representatives as well as employees responsible for hiring, supervising, training, assigning, or dispatching of drivers and employees concerned with the installation, inspection, and maintenance of motor vehicle equipment and/or accessories. For purposes of this subchapter, this definition includes the terms employer, and exempt motor carrier.
49 CFR § 390.5T
Unless specifically defined elsewhere, in this subchapter: