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expiration of [noun]
The expiration of the contract is next month.
合同的到期是下个月。
到期；期满；终止
先理解核心含义，再看它在真实句子里的用法。
到期；期满；终止
The act, process, or instance of coming to an end or no longer being in effect.
The expiration of the contract is next month.
合同的到期是下个月。
呼气或到期的行为、过程或实例。
An act, process, or instance of expiring.
The insurance policy will automatically renew unless you cancel before the expiration date.
除非你在到期日之前取消，否则保险单将自动续保。
After a long illness, his grandmother finally reached her expiration peacefully at home.
久病之后，他的祖母在家中安详地走到了生命的尽头。
The yoga instructor emphasized slow, controlled expiration to release tension.
瑜伽教练强调缓慢、有控制的呼气以释放紧张。
The expiration of the contract is next month.
合同的到期是下个月。
Check the expiration date before using.
使用前检查有效期。
用于正式语境
The policy will be renewed on expiration.
该政策到期后续期。
Not this
The membership will expiration next month.
Use this
The membership will expire next month.
将名词 expiration 误用作动词。expiration 是名词，表示“期满、到期”，而句中需要动词，应使用 expire。
Not this
He left the job in the expiration of his contract.
Use this
He left the job on the expiration of his contract.
介词使用错误。表示“在…期满时”固定搭配为 on/upon the expiration of，而不是 in。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
有效期；到期日
Check the expiration date before buying milk.
买牛奶前要检查有效期。
合同到期
The expiration of the contract caused delays.
合同到期导致了延误。
签证到期
His visa expiration forced him to leave.
他的签证到期迫使他离开。
任期届满
At the expiration of his term, he retired.
任期届满时，他退休了。
呼气
The doctor listened to the patient's expiration of breath.
医生听了病人的呼气声。
到期时
The agreement ends on expiration of the notice period.
协议在通知期届满时终止。
在……结束时；在……期满时
At the expiration of the lease, the tenant must vacate the property.
租约期满时，租户必须搬出该房产。
已过有效期的；过时的
That policy is long past its expiration date, so no one takes it seriously anymore.
那项政策早就过时了，所以没人再把它当回事。
Use expiration naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 expiration 拆成 expire（到期/呼气）+ ation（名词），记忆：到期之日，一口气呼出。
语域：mixed 常见场景：food/medicine expiration dates、contracts, permits, and official documents、medical/physiological descriptions of breathing expiration 主要有两个意思。表示“到期、期满”时，多用于食品保质期、合同或证件有效期等场合，语气中性偏正式；表示“呼气”时较专业，比较常见于医学或生理学语境。日常口语中若指有效期，更常用 expiration date 或 expiry。
All listed words end in -ation and rhyme with expiration: the stressed vowel /eɪ/ is followed by /ʃən/. Beware lookalikes such as ration /ˈræʃən/ and expire /ɪkˈspaɪər/, which do not rhyme.
Dictionary facts from ECDICT, WIKTIONARY.