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currency
This term carries a dual identity of value and circulation. In financial terms, it evokes the image of a medium of exchange that is recognized and trusted by a collective society, shifting the focus from the physical coin or bill to the abstract system of value it represents. When applied to ideas or customs, the word suggests a social momentum. It describes how a thought or belief spreads through a population like a liquid, gaining power not through truth alone, but through widespread adoption and current popularity.
Countable when referring to different national monetary systems like the dollar or the euro. Uncountable when referring to the general concept of money or the quality of being current and accepted.