expiration
nounUK /ˌɛk.spəˈɹeɪ̯.ʃən/ · US /ˌɛk.spɚˈeɪ̯.ʃən/
Etymology From Middle English expiracioun, exspiracioun (“vapor, breath”), from Latin expīrātiōnem, exspīrātiōnem, accusative singular of expīrātiō, exspīrātiō. By surface analysis, expire + -ation.
› An act, process, or instance of expiring.
1
The act or process of breathing out, or forcing air from the lungs through the nose or mouth.
- Holonym: respiration
- crackles heard on expiration
2
A single outward breath.
- labored expirations
3
Other similar release of volatile matter.
4
Euphemistic The last emission of breath; thus, synonym of death.
5
Any other (metaphorically comparable) cessation, extinction, or ending.
- expiration date
6
That which is produced by breathing out, as a sound.
- Derived terms
- expirational, expiration date, expiration time, postexpiration, time until expiration