Currency (noun)

1. A system of money in general use in a particular country.
2. The type of money used in a particular country.
3. The quality or state of being used or accepted by many people.
4. The state or quality of being in circulation.
5. The supply of money in circulation and available for use.

Origin:

Late middle english curraunce, from old french currence, from medieval latin currentia, from latin currens, present participle of currere ("to run"), because money was used in trade and had to be constantly in circulation.

Examples:

1. The local currency was the euro.
2. She converted her dollars into the local currency.
3. The company has a high currency in the market.
4. The value of the currency fluctuated wildly due to political turmoil.
5. The central bank sought to increase the currency in circulation.