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English definition of “union”

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union

noun uk   /ˈjuː.ni.ən/ us  

union noun (JOINING)

B2 [S or U] the act or the state of being joined together: Meanwhile the debate on European political and monetary union continues. formal She believes that the union (= marriage) of man and woman in holy matrimony is for ever.the Union [S] (in the American Civil War) the states that did not separate from the United States
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union noun (WORKERS)

B1 [C, + sing/pl verb] a trade union : the electricians' union
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(Definition of union from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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