expiration
/ˌekspɪˈreɪʃn; ˌɛkspə`reʃən/ n[U]
(fml 文)
1 ending, esp of the period when a contract, etc is in force 终止, 届期, 期满, 满期（尤指合同等的有效期）
the expiration of the lease, tenancy, agreement, contract, etc 租约、 租用、 协议、 合同等的期满.
2 (esp medical 尤用於医学) breathing out (of air) （空气的）呼出.