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To place in a friendly association, as by treaty: Italy allied itself with Germany during World War II.
(verb-transitive)
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To unite or connect in a personal relationship, as in friendship or marriage.
(verb-transitive)
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To enter into an alliance: Several tribes allied to fend off the invaders.
(verb-intransitive)
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One that is allied with another, especially by treaty: entered the war as an ally of France.
(noun)
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One in helpful association with another: legislators who are allies on most issues. See Synonyms at partner.
(noun)
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.