verb (used with object), fortified, fortifying.
to protect or strengthen against attack; surround or provide with defensive military works.
to furnish with a means of resisting force or standing strain or wear: to fortify cotton with nylon.
to make strong; impart strength or vigor to: to fortify oneself with a good breakfast.
to increase the effectiveness of, as by additional ingredients: to fortify a diet with vitamins; to fortify a lotion with lanolin.
to strengthen mentally or morally: to be fortified by religious faith.
to confirm or corroborate: to fortify an accusation with facts.
Nutrition. to add one or more ingredients to (a food) to increase its nutritional content.
to add alcohol to (wine or the like).
verb (used without object), fortified, fortifying.
to set up defensive works; erect fortifications.

1400–50; late Middle English fortifien < Middle French fortifier < Late Latin fortificāre, equivalent to Latin forti(s) strong + -ficāre -fy

fortifiable, adjective
fortifier, noun
fortifyingly, adverb
nonfortifiable, adjective
nonfortifying, adjective
refortify, verb (used with object), refortified, refortifying.
underfortify, verb (used with object), underfortified, underfortifying.
unfortifiable, adjective
unfortified, adjective
well-fortified, adjective

3. strengthen, reinforce. 5. hearten, embolden. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fortify (ˈfɔːtɪˌfaɪ)
vb , -fies, -fying, -fied
1.  (also intr) to make (a place) defensible, as by building walls, digging trenches, etc
2.  to strengthen physically, mentally, or morally
3.  to strengthen, support, or reinforce (a garment, structure, etc)
4.  to add spirits or alcohol to (wine), in order to produce sherry, port, etc
5.  to increase the nutritious value of (a food), as by adding vitamins and minerals
6.  to support or confirm: to fortify an argument with facts
[C15: from Old French fortifier, from Late Latin fortificāre, from Latin fortis strong + facere to make]

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

mid-15c., "provide (a town) with walls and defenses," from M.Fr. fortifier, from L.L. fortificare, from L. fortis "strong" (see fort) + facere "to make" (see factitious). Sense of "to strengthen mentally or morally" is from late 15c. Meaning
"add liquor or alcohol" is from 1880. Related: Fortified; fortifying.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Suburban fortified developments are also proliferating.
The others were fed an ordinary diet, not fortified with microbes.
Fortified breads and cereals, as well as yeast, include this vitamin.
Dried pasta is simple to prepare, inexpensive, and often fortified with folic
  acid and other nutritious ingredients.
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