Etymology
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fortify (v.)

early 15c., "increase efficacy" (of medicine); mid-15c., "provide (a town) with walls and defenses," from Old French fortifiier (14c.) "to fortify, strengthen," from Late Latin fortificare "to strengthen, make strong," from Latin fortis "strong" (see fort) + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Sense of "to strengthen mentally or morally" is from late 15c. Meaning "add liquor or alcohol" is from 1880; meaning "add nutrients to food" is from 1939. Related: Fortified; fortifying.

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Definitions of fortify

fortify (v.)
make strong or stronger;
Synonyms: strengthen / beef up
fortify (v.)
prepare oneself for a military confrontation;
Synonyms: arm / build up / gird
fortify (v.)
add nutrients to;
fortified milk
fortify (v.)
add alcohol to (beverages);
Synonyms: spike / lace
fortify (v.)
enclose by or as if by a fortification;
Synonyms: fort
From wordnet.princeton.edu