Taber's Medical Dictionary
expiration
(ĕks″pĭ-rā′shŭn )
To hear audio pronunciation of this topic, purchase a subscription or log in.[Gr. ex, out, + L. spirare, to breathe]
1. Expulsion of air from the lungs in breathing. Normally the ratio of the duration of inspiration to expiration is 1:3. Exhalation takes longer than inspiration because exhalation occurs passively.
SEE: diaphragm for illus.; SEE: inspiration; SEE: respiration
2. Death.
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Citation
Venes, Donald, editor. "Expiration." Taber's Medical Dictionary, 25th ed., F.A. Davis Company, 2025. Taber's Online, www.tabers.com/tabersonline/view/Tabers-Dictionary/769611/all/expiration.
Expiration. In: Venes DD, ed. Taber's Medical Dictionary. F.A. Davis Company; 2025. https://www.tabers.com/tabersonline/view/Tabers-Dictionary/769611/all/expiration. Accessed April 24, 2026.
Expiration. (2025). In Venes, D. (Ed.), Taber's Medical Dictionary (25th ed.). F.A. Davis Company. https://www.tabers.com/tabersonline/view/Tabers-Dictionary/769611/all/expiration
Expiration [Internet]. In: Venes DD, editors. Taber's Medical Dictionary. F.A. Davis Company; 2025. [cited 2026 April 24]. Available from: https://www.tabers.com/tabersonline/view/Tabers-Dictionary/769611/all/expiration.
* Article titles in AMA citation format should be in sentence-case
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