[] () ( ˈbill rate) the amount that the price of a bill of exchange is reduced by when it is bought before it reaches its payment date贴现率 () in the US and other countries, the rate of interest at which banks can borrow money from the Federal Reserve Bank（银行向储备银行借款的）利率 () a rate of interest that is used to calculate how much an amount of money that will be paid or received in the future is worth now折现率