(n.) A gentle slope, or a smooth, gently sloping bank; especially (Fort.), that slope of earth which inclines from the covered way toward the exterior ground or country (see Illust. of Ravelin).

abatis advanced work balistraria bank banquette barbed-wire entanglement barbican barricade barrier bartizan bastion battlement bevel bezel breastwork bulwark casemate cheval-de-frise chute circumvallation contravallation counterscarp curtain demibastion dike drawbridge earthwork easy slope enclosure entanglement escarp escarpment fence fieldwork fleam fortalice fortification gentle slope grade gradient hanging gardens helicline hillside inclination incline inclined plane launching ramp loophole lunette machicolation mantelet merlon mound outwork palisade parados parapet pitch portcullis postern gate ramp rampart ravelin redan redoubt sally port scarp sconce shelving beach side slope steep slope stiff climb stockade talus tenaille vallation vallum work