Cŏn/tra-val-lā'tion, n.

n. [contra and vallation, q. v.; Fr. contrevallation, It. contravallazione, Sp. contravallacion.] (Fort.) A trench guarded with a parapet, formed by the besiegers between their camp and the place besieged, to secure themselves, and check sallies of the garrison. Brande.