n. [ F. bastion (cf. It. bastione), fr. LL. bastire to build (cf. F. bâtir, It. bastire), perh. from the idea of support for a weight, and akin to Gr.
a. Furnished with a bastion; having bastions. [ 1913 Webster ]
n. [ Cf. F. demi- bastion. ] (Fort.) A half bastion, or that part of a bastion consisting of one face and one flank. [ 1913 Webster ]