a charge made for changing money of one currency into another, or for changing banknotes into cash nouna charge made for changing money of one currency into another, or for changing banknotes into cashthe difference between two values, such as between the interest charged on loans made by a bank and the interest paid by the bank on deposits, or the difference between the values of two currencies the difference between two values, such as between the interest charged on loans made by a bank and the interest paid by the bank on deposits, or the difference between the values of two currencies