Definitions
1.nounThe sloping earthen embankment behind a defensive wall.
2.nounThe level platform atop a wall, typically protected by a parapet and (strictly) distinguished from the slightly higher banquette used by its defenders.
3.nounAny level base used by artillery in the field.
4.nounAny earthen embankment with a broad level top, such as those used for a canal elevated above a valley floor.