/ ˈfɔːtɪfaɪ; NAmE ˈfɔːrt-/ verb ( for·ti·fies , for·ti·fy·ing , for·ti·fied , for·ti·fied ) [ vn ]
1.
fortify sth (against sb/sth) to make a place more able to resist attack, especially by building high walls :
a fortified town
2.
fortify sb / yourself (against sb/sth) to make sb/yourself feel stronger, braver, etc. :
He fortified himself against the cold with a hot drink.
3.
to make a feeling or an attitude stronger :
The news merely fortified their determination.
4.
fortify sth (with sth) to increase the strength or quality of food or drink by adding sth to it :
Sherry is fortified wine (= wine with extra alcohol added) .
cereal fortified with extra vitamins
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WORD ORIGIN
late Middle English : from French fortifier , from late Latin fortificare , from Latin fortis strong.