agio

noun, plural ag·i·os.

1. a premium on money in exchange.
2. an allowance for the difference in value of two currencies.
3. an allowance given or taken on bills of exchange from other countries, as to balance exchange expenses.
4. agiotage.

noun plural -ios

1. 1. the difference between the nominal and actual values of a currency
   2. the charge payable for conversion of the less valuable currency
2. a percentage payable for the exchange of one currency into another
3. an allowance granted to compensate for differences in currency values, as on foreign bills of exchange
4. an informal word for agiotage