1) Exchangeability 2) Foreign exchange market 3) Fungibility 4) Interchangeability 5) Interchangeableness 1) Identity 
Convertibility is the quality that allows money or other financial instruments to be converted into other liquid stores of value. Convertibility is an important factor in international trade, where instruments valued in different currencies must be exchanged. ==Currency trading== Freely convertible currencies have immediate value on the foreign ex...
• (n.) The condition or quality of being convertible; capability of being exchanged; convertibleness.
The degree of freedom to exchange a currency without government restrictions or controls. 
The ability to change a loan from an adjustable rate schedule to a fixed rate schedule. 
The value of a convertible security if it is converted immediately. Also called parity value.
Con·vert`i·bil'i·ty noun The condition or quality of being convertible; capability of being exchanged; convertibleness. « The mutual convertibility of land into money, and of money into land. Burke. » 
The ability to change a loan from an adjustable rate schedule to a fixed rate schedule.
[n] - the quality of being exchangeable (esp the ability to convert a currency into gold or other currencies without restriction)
noun the quality of being exchangeable (especially the ability to convert a currency into gold or other currencies without restriction)
The ability to change a loan from an adjustable rate schedule to a fixed rate schedule.