ex·pi·ra·tion
noun/ˌekspəˈreɪʃn/
/ˌekspəˈreɪʃn/
(North American English) (British English expiry)
[uncountable]- an ending of the period of time when an official document can be used, or when an agreement is legally acceptable
（文件、协议等的）满期，届期，到期 - the expiration of a fixed-term contract
定期合同到期 - on expiration The license can be renewed on expiration.
许可证到期后可以续签。
Oxford Collocations DictionaryExpiration is used before these nouns:- date
Word Originlate Middle English (denoting a vapour or exhalation): from Latin exspiratio(n-), from the verb exspirare ‘breathe out’, from ex- ‘out’ + spirare ‘breathe’. - the expiration of a fixed-term contract