Webster's English Dictionary

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bastion

bas.tion \'bas-ch*n, 'bas-te--*n\ \-ch*nd, -te--*nd\ n [MF, fr. bastille 
   fortress, modif. of OProv bastida, fr. bastir)X to build, of Gmc origin; 
   akin to OHG besten to patch 1: a projecting part of a fortification  2: a 
   fortified area or position  3: something that is considered a stronghold : 
   BULWARK  - bas.tioned aj