{Half volley}. (a) (Tennis) A return of the ball immediately after is has touched the ground. (b) (Cricket) A sending of the ball so that after touching the ground it flies towards the top of the wicket. --R. A. Proctor. {On the volley}, at random. [Obs.] ``What we spake on the volley begins work.'' --Massinger. {Volley gun}, a gun with several barrels for firing a number of shots simultaneously; a kind of mitrailleuse.