Topic: CURRENCIES
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con‧ver‧ti‧ble1

1 an object that is convertible can be folded or arranged in a different way so that it can be used as something else :
a convertible sofa
a convertible sofa3 technical a financial document such as an insurance arrangement or a bond that is convertible can be exchanged for money, stocks etc
—convertibility
noun [uncountable]
noun [uncountable]