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To make strong, as:
(verb-transitive)
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To strengthen and secure (a position) with fortifications.
(verb-transitive)
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To reinforce by adding material.
(verb-transitive)
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To impart physical strength or endurance to; invigorate.
(verb-transitive)
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To give emotional, moral, or mental strength to; encourage: Prayer fortified us during our crisis.
(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.