expiration
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
- the expiration of a fixed-term contract
 - on expiration The license can be renewed on expiration.
 
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’.