Fleet \Fleet\, a. [Compar. {Fleeter}; superl. {Fleetest}.] [Cf. Icel. flj?tr quick. See {Fleet}, v. i.] 1. Swift in motion; moving with velocity; light and quick in going from place to place; nimble. In mail their horses clad, yet fleet and strong. --Milton. 2. Light; superficially thin; not penetrating deep, as soil. [Prov. Eng.] --Mortimer.