expiration

noun

ex·​pi·​ra·​tion ˌek-spə-ˈrā-shən 

1

a

: the last emission of breath : death

b(1)

: the act or process of releasing air from the lungs through the nose or mouth : exhalation

(2)

: the escape of carbon dioxide from the body protoplasm (as through the blood and lungs or by diffusion)

2

: the fact of coming to an end or the point at which something ends : termination

Synonyms of expiration

• demise
• termination
• death
• dissolution

Examples of expiration in a Sentence

one month after the expiration of the contract

directed that upon her expiration her splendid Italian-style villa be given to the public as a museum

Recent Examples on the Web

The expiration of the tax credits means enrollees will see annual premiums more than double — from an average of $888 in 2025 to $1,904 in 2026, according to health care research nonprofit KFF. —Marc Levy, Fortune, 8 Dec. 2025

But with premiums set to rise in the new year with the expiration of the tax credits, some GOP lawmakers have acknowledged a need for a short-term extension. —Kaia Hubbard, CBS News, 8 Dec. 2025

Those tokens will stay in your account for 14 days before expiration. —Tyler Everett, MSNBC Newsweek, 5 Dec. 2025

Democrats put this issue front and center in the month-and-a-half government shutdown, banging the drum about the looming expiration and slamming Republicans’ hesitation to extend the subsidies. —David Goldman, CNN Money, 4 Dec. 2025

Word History

First Known Use

circa 1530, in the meaning defined at sense 1a

Phrases Containing expiration

• expiration date

Rhymes for expiration

• abdication
• aberration
• abjuration
• abnegation
• abrogation
• acceptation
• acclamation
• acclimation
• accusation
• activation
• actuation
• acylation

Kids Definition

expiration

noun

ex·​pi·​ra·​tion ˌek-spə-ˈrā-shən 

1

a

: the expelling of air from the lungs in breathing

b

: air or vapor expelled from the lungs

2

: the fact of coming to an end

Medical Definition

expiration

noun

ex·​pi·​ra·​tion ˌek-spə-ˈrā-shən 

1

a(1)

: the act or process of releasing air from the lungs through the nose or mouth : exhalation

(2)

: the escape of carbon dioxide from the body protoplasm (as through the blood and lungs or by diffusion)

b

archaic : the last emission of breath : death

2

: something produced by breathing out