/
ˈfɔːtɪfʌɪ/
v.
 (fortifies, fortifying, fortified)
   - provide with defensive works as protection against attack.
- invigorate or encourage.
- 
[often as adj. fortified]
 add spirits to (wine) to make port, sherry, etc. ▸increase the nutritive value of (food) by adding vitamins. 
Derivative
- fortifiable adj.
- fortifier n.
Etymology
ME: from Fr. fortifier, from late L. fortificare, from L. fortis ‘strong’.