noun
a group of countries that have agreed to eliminate tariffs and other trade barriers between themselves, and to adopt common external tariffs on goods from countries outside the union
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The two countries agreed to form a customs union to facilitate trade between them.
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Joining the customs union will make it easier for us to buy and sell goods with our neighboring countries.
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Being part of the customs union means we can avoid all the hassle of import and export paperwork.
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In a way, being in a customs union is like being part of a big club where everyone helps each other out with trade agreements.