Currency is the system of money in general use in a country, such as coins, banknotes, or digital money. It can also mean something that is widely accepted or used at a particular time.
From Latin *currens* “running,” from *currere* “to run,” through a sense of things that are in circulation or ‘running’ through society. It first referred to things in active use, then more specifically to money.
Money is called ‘currency’ because it flows—moving from hand to hand like a current in a river. Ideas and trends also have currency when they ‘circulate’ widely, which is why we say a rumor or belief ‘has no currency anymore.’
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