From Longman Business Dictionary
expiryex·pir·y /ɪkˈspaɪəri-ˈspaɪri/ noun [uncountableU] British EnglishBrE when an official document, period of time, or right to buy shares, currency etc expiresSYN AmE expirationThe sellers’ right to repossess the goods did not arise until the expiry of the credit period.