bas·tion / ˈbaschən/ • n. a projecting part of a fortification built at an angle to the line of a wall, so as to allow defensive fire in several directions. ∎ fig. an institution, place, or person strongly defending or upholding particular principles, attitudes, or activities: the last bastion of male privilege.
BASTION. A projection of a fortification that permits the defender to fire along the front of the main wall (or "curtain").
SEE ALSO Enfilade.