Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Old French
Origin: Late Latin unio, from Latin unus 'one'

union

 noun
     
NEW! See related topics: LABOUR RELATIONS, UNIONSGOVERNMENTFAMILY
u‧nion S1 W1
1 [countable] also trade union British English, labor union American EnglishBELBEL an organization formed by workers to protect their rights
union of
the National Union of Teachers
Are you planning to join the union?
2 used in the names of some clubs or organizations:
the British Golf Union
3 [singular] formal the act of joining two or more things together, or the state of being joined together
union of
The artist's work shows the perfect union of craftsmanship and imagination.
union with
Some militants favour independence for Kashmir or union with Pakistan.
4PG [singular] a group of countries or states with the same central government:
the Soviet Union
5

the Union

used in the past to talk about the United States, especially the northern states during the Civil War
6 [uncountable and countable] formalSSF marriage
7 [uncountable and countable] formal the activity of having sex, or an occasion when this happens
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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