Webster's English Dictionary

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fortify

for.ti.fy \-.fi-\ vb [ME fortifien, fr. MF fortifier, fr. LL fortificare, 
   fr. L Xfortis strong : to make strong : as  : to strengthen and secure (as 
   a town) by forts or batteries  : to give physical strength, courage, or 
   endurance to : INVIGORATE)M : to add mental or moral strength to : 
   ENCOURAGE  : to add material to for strengthening or enriching  : to erect 
   fortifications