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English definition of “alliance”

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alliance

noun [C] uk   /əˈlaɪ.əns/ us  
C2 a group of countries, political parties, or people who have agreed to work together because of shared interests or aims: a military alliance NATO is sometimes called the Atlantic Alliance.C2 an agreement to work with someone else to try to achieve the same thing: The three smaller parties have forged/formed an alliance against the government. Some of us feel that the union is in alliance with management against us.
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(Definition of alliance from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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