"A currency (from Middle English: curraunt, "in circulation", from Latin: currens, -entis), in the most specific sense is money in any form when in use or ...
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circulation as a medium of exchange, especially circulating banknotes and coins. A more general definition is that a currency is a system of money (monetary units) in common use, especially for people in a nation. Under this definition, U.S. dollars (US$), pounds sterling (£), Australian dollars (A$), European euros (€), Russian rubles (₽) and Indian rupees (₹) are examples of currencies. These various currencies are recognized as stores of value and are traded between nations in foreign exchange markets, which determine the relative values of the different currencies. Currencies in this sense are defined by governments, and each type has limited boundaries of acceptance." - (en.wikipedia.org 30.09.2019)
