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Learner's definition of UNION  
[count]  : an organization of workers formed to protect the rights and interests of its members
— called also "US"labor union"British"trade union
[noncount]  : an act of joining two or more things together
[singular]  : a group of states or nations that are ruled by one government or that agree to work together
the Union 
: the United States
◊ The State of the Union address is a yearly speech given by the U.S. President to Congress and the people to tell them about important things that are affecting the country.
   b  : the group of northern states that supported the federal government during the American Civil War — often used as Union before another noun
[count]  : an organized group of people, businesses, etc., that have the same purpose or interest
— see also student union
formal  : the act of getting married or of causing two people to be married
— see also civil union
[count, noncount]formal  : the activity or an act of having sex
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