[bas-chuhn, -tee-uhn]
Fortification. a projecting portion of a rampart or fortification that forms an irregular pentagon attached at the base to the main work.
a fortified place.
anything seen as preserving or protecting some quality, condition, etc.: a bastion of solitude; a bastion of democracy.

1590–1600; < Middle French < Italian bastione, equivalent to Upper Italian bastí(a) bastion, orig., fortified, built (cognate with Italian bastita, past participle of bastire to build < Germanic; see baste1) + -one augmentative suffix

bastionary [bas-chuh-ner-ee] , adjective
bastioned, adjective

2. fortress, fort, bulwark, stronghold, citadel. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bastion (ˈbæstɪən)
1.  a projecting work in a fortification designed to permit fire to the flanks along the face of the wall
2.  any fortified place
3.  a thing or person regarded as upholding or defending an attitude, principle, etc: the last bastion of opposition
[C16: from French, from earlier bastillon bastion, from bastilleBastille]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1560s, from M.Fr. bastillon, dim. of O.Fr. bastille "fortress, tower, fortified, building," from O.Prov. bastir "build," originally "make with bast" (see baste (1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It consisted of a fortified town and a defensive bastion.
Hollywood has long been considered a bastion of liberal activism.
America's nutritional tsunami is rolling into the nation's last bastion of
  guilt-free gluttony: the pizza parlor.
Libraries, which were once the bastion of hardcovers, now prefer trade paper.
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