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BNC: 27079 COCA: 16118

expiration

expiration /ˌɛkspəˈreɪʃən/ noun
expiration
/ˌɛkspəˈreɪʃən/
noun
Learner's definition of EXPIRATION
[noncount]
: the fact of coming to an end or no longer being valid after a period of time : the fact of expiring到期;期满;届期
medical : the act of breathing out呼气;吐气

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