Definition of UN abbreviation from the Oxford Advanced American Dictionary

 

UN

 abbreviation
(also U.N.)abbreviation
NAmE//ˌyu ˈɛn//
 
 
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United Nations(an association of many countries that aims to help economic and social conditions improve and to solve political problems in the world in a peaceful way) the UN Security Council a UN peacekeeping plan
See the Oxford Advanced Learner's Dictionary entry: UN