• IPA: /ˌfɔː(ɹ)tɪfɪˈkeɪʃən/, /ˌfɔː(ɹ)tɪfəˈkeɪʃən/

fortification

1. The act of fortifying; the art or science of fortifying places to strengthen defence against an enemy.
2. That which fortifies; especially, a work or works erected to defend a place against attack; a fortified place; a fortress; a fort; a castle.
   • 1910, Emerson Hough, chapter I, in The Purchase Price: Or The Cause of Compromise, Indianapolis, Ind.: The Bobbs-Merrill Company, OCLC 639762314 ↗, page 0088 ↗:

     “[…] We are engaged in a great work, a treatise on our river fortifications, perhaps? But since when did army officers afford the luxury of amanuenses in this simple republic? […] ”

3. An increase in effectiveness, as by adding ingredients.
   • 1979, Kiplinger's Personal Finance (volume 33, number 7, July 1979, page 47)

     Compare the nutrition information label of a regular ready-to-eat fortified cereal with that of a presweetened brand and you'll note that, although the sweetened one's sugar content is higher, the fortification is virtually identical.

4. A jagged pattern sometimes seen during an attack of migraine.

• French: fortification, renforcement
• German: Festungsbau, Befestigen
• Italian: fortificazione
• Portuguese: fortificação
• Russian: фортифика́ция
• Spanish: fortificación

• French: fortification, renforcement
• German: Festung, Fort
• Italian: fortificazione
• Portuguese: fortificação
• Russian: укрепле́ния
• Spanish: fortificación