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 act made clear the exemption no longer applies to MLB players’ salaries and other aspects of big league employment—an important point given that MLB is expected to lock out players in December following expiration of a collective bargaining agreement with the MLBPA. —Michael McCann, Sportico.com, 2 Mar. 2026

But if the owners and players refuse to enact real reform, the expiration of a collective-bargaining agreement in December could lead not only to a lockout and lost games next year but a decline in the popularity and competitiveness of the national pastime itself. —Paul Bledsoe, Baltimore Sun, 2 Mar. 2026

December’s expiration of enhanced subsidies on the insurance exchanges is now driving double- and even triple-digit percentage premium increases for roughly 20 million enrollees. —Robert Pearl, Twin Cities, 1 Mar. 2026

Players within a six-month window of the expiration of their contract can negotiate a pre-contract to make a free transfer to another team upon expiration of the current contract. —Daniel Sperry, Kansas City Star, 27 Feb. 2026

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