n. (Mil.)
n. [ Pref. contra- + vallation: cf. F. contrevallation. Cf. Countervallation. ] (Fort.) A trench guarded with a parapet, constructed by besiegers, to secure themselves and check sallies of the besieged. [ 1913 Webster ]
n. (Fort.) See Contravallation. [ 1913 Webster ]
n. [ L. vallatio, fr. vallare to surround with a rampart, fr. vallum rampart. See Wall, n. ] A rampart or intrenchment. [ 1913 Webster ]