the differences in yield resulting from different levels of cedit risk.这是牛津金融词典上的解释。
credit risk 指信用风险。简单的说就是信用风险等级的不同导致的不同的贷款利率差异。
A spread option position in which the price of the option sold is greater than the price of the option bought.
以上是标准的definition
简单举个例子:
银行已10%的利率发放贷款,同时以8%的利率吸收存款,那么这之间的2%的利率差就是credit spread