Definition of: bastion

(bas′chən, -tē·ən) noun
1. In fortifications, a projecting work having two faces and two flanks so constructed that the adjacent curtain may be defended from it.
2. Any fortified or strongly defended place or position. [<F <Ital. bastione <bastire build]
—bas′tioned adjective
BASTION
a. Boulevard.
b. Ramps.
c. Flank.
d. Banquette.
e. Salient.
f. Face of rampart.
g. Berm.
h. Moat.
i. Glacis.
j. Scarp.
k. Embrasure in parapet.
The curtains extending from its flanks (c) are on both sides of the bastion.