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1. Make strong or stronger
   "This exercise will fortify your upper body";
   - strengthen, beef up
    
2. Enclose by or as if by a fortification
   - fort
    
3. Prepare oneself for a military confrontation
   "troops are fortifying on the Iraqi border";
   - arm, build up, gird
    
4. (cooking) add nutrients to
   "fortified milk"
    
5. (cooking) add alcohol to (beverages)
   "the punch is fortified!";
   - spike, lace

Derived forms: fortified, fortifies, fortifying

Type of: add, alter, change, close in, enclose, inclose, modify, shut in

Antonym: demilitarise [Brit], weaken

Encyclopedia: Fortify