Definition of expiration noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌekspəˈreɪʃn//
; NAmE NAmE//ˌekspəˈreɪʃn//
[uncountable](North American English, formal)
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= expiry Word Origin late Middle English (denoting a vapour or exhalation): from Latin exspiratio(n-), from the verb exspirare ‘breathe out’, from ex- ‘out’ + spirare ‘breathe’.
See the Oxford Advanced American Dictionary entry: expiration