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FOR'TIFY, verb transitive

1. To surround with a wall, ditch, palisades or other works, with a view to defend against the attacks of an enemy; to strengthen and secure by forts, batteries and other works of art; as, to fortify a city, town or harbor.

2. To strengthen against any attack; as, to fortify the mind against sudden calamity.

3. To confirm; to add strength and firmness to; as, to fortify an opinion or resolution; to fortify hope or desire.

4. To furnish with strength or means of resisting force, violence or assault.

FOR'TIFY, verb intransitive To raise strong places.