48 C.F.R. § 8.1101
As used in this subpart—
Leasing, means the acquisition of motor vehicles, other than by purchase from private or commercial sources, and includes the synonyms hire and rent.
Motor vehicle means an item of equipment, mounted on wheels and designed for highway and/or land use, that—
[48 FR 42129, Sept. 19, 1983, as amended at 66 FR 2128, Jan. 10, 2001; 84 FR 19844, May 6, 2019]