the act of fortifying or strengthening.
something that fortifies or protects.
the art or science of constructing defensive military works.
Often, fortifications. military works constructed for the purpose of strengthening a position; a fort: Supposedly impregnable, the fortifications were quickly overrun.
a strengthening or improvement, as by addition of or intensification with another ingredient: the fortification of milk with vitamin D; the fortification of wine with alcohol.

1400–50; late Middle English < Late Latin fortificātiōn- (stem of fortificātiō), equivalent to fortificāt(us) fortified (see fortify, -ate1) + -iōn- -ion

nonfortification, noun
refortification, noun

4. fortress, citadel, stronghold, bulwark. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fortification (ˌfɔːtɪfɪˈkeɪʃən)
1.  the act, art, or science of fortifying or strengthening
2.  a.  a wall, mound, etc, used to fortify a place
 b.  such works collectively
3.  any place that can be militarily defended

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

early 15c., strengthening, also defensive earthworks, tower, from M.Fr. fortification, from L.L. fortificationem (nom. fortificatio), from fortificare (see fortify).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Along with the well-preserved fortifications, you'll find a restaurant and a
  picnic area.
Orchestral strings build fortifications or quiver to make the whole soundscape
The hilltop ruins of old fortifications are reminders that clans once ruled
  this remote land.
Explore the fortifications by taking a self guided tour.
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