Multicountry union using the same currency

• Regret returning down under, sole region sharing its bread
• Western union locale?
• 19 nations with a common currency
• Group of countries using a common currency

Wikipedia Word definitions in Wikipedia
The eurozone , officially called the euro area , is a monetary union of 19 of the 28 European Union (EU) member states which have adopted the euro (€) as their common currency and sole legal tender . The monetary authority of the eurozone is the Eurosystem ...

Wiktionary Word definitions in Wiktionary
n. (alternative case form of Eurozone English)