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
It would also be the first fortification made to prevent a birth defect.
If a breakfast cereal has metallic iron, it maybe comes from a contamination
  source, not from a fortification compound.
The final fortification is a cheese sauce poured over the flour tortilla jacket.
She deplores the changed role of fortification from a public-health measure to
  a sales gimmick.
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