union  
noun uk/ˈjuː.njən/ us/ˈjuː.njən/
  (JOINING)        
 B2 [ S or U ]联合;结合;合并;统一 
the act or the state of being joined together
  Meanwhile the debate on European political and monetary union continues. 同时,有关欧洲政治和货币联盟的争论还在继续。 
formal She believes that the union (= marriage) of man and woman in holy matrimony is for ever. 她相信男女之间的神圣结合是永久的。 
 the Union [ S ](美国内战时的)联邦 
(in the American Civil War) the states that did not separate from the United States
 - More examples
 - The signing of the treaty marked a major milestone on the road to European union.
 - The two countries are holding a summit to discuss economic and monetary union.
 
  (WORKERS)      
B1 [ C, + sing/pl verb ]工会(同 trade union) 
a  trade union UK 
  the electricians' union 电工工会 
 - More examples
 - Management are having discussions with the union about possible redundancies.
 - The car workers' union is demanding a 7% pay rise this year.
 - Her debating skills were honed in the students' union.
 - The union decided to ballot its members on the issue .
 - The union safeguards the interests of all its members.