an association of independent nations or tariff areas created to remove customs barriers between them and to adopt a uniform tariff policy toward nonmember nations.
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Examples from the Web for customs union
The Customs-union embraces more than four-fifths of Germany, with the exception of Austria.
British Dictionary definitions for customs union
an association of nations which promotes free trade within the union and establishes common tariffs on trade with nonmember nations
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012