Пример употребления: A currency union (also known as monetary union) is where two or more states share the same currency, though without there necessarily having any further integration such as an Economic and Monetary Union, which has, in addition, a customs union and a single market. (Wikipedia).
The Scottish government wants to set up a currency union with the rest of the UK if Scotland votes for independence. (BBC News).
Пример употребления: monetary union Two or more countries with a single currency, or different currencies having a fixed mutual exchange rate monitored and controlled by one central bank (or several central banks with closely coordinated monetary policies).
(BusinessDictionary).