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American Heritage Dictionary - Cite This Source - Share This

ex·pire       (ĭk-spīr')  Pronunciation Key  v.   ex·pired, ex·pir·ing, ex·pires v.   intr. To come to an end; terminate: My membership in the club has expired. To breathe one's last breath; die: The patient expired early this morning. To exhale; breathe out. v.   tr. To breathe (something) out. Archaic To give (something) off. [Middle English expiren, from Old French expirer, from Latin exspīrāre : ex-, ex- + spīrāre, to breathe.]

Online Etymology Dictionary - Cite This Source - Share This
expire 

WordNet - Cite This Source - Share This

expire
verb
1.	lose validity; "My passports expired last month" [syn: run out]
2.	pass from physical life and lose all bodily attributes and functions necessary to sustain life; "She died from cancer"; "The children perished in the fire"; "The patient went peacefully"; "The old guy kicked the bucket at the age of 102" [syn: die] [ant: be born]
3.	expel air; "Exhale when you lift the weight" [syn: exhale] [ant: breathe in]

American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

expire ex·pire (ĭk-spīr')
v. ex·pired, ex·pir·ing, ex·pires

1. To breathe one's last breath; die.
2. To exhale.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Expire

Ex*pire"\, v. t. [imp. & p. p. Expired; p. pr & vb. n. Expiring.] [L. expirare, exspirare, expiratum, exspiratum; ex out + spirare to breathe: cf. F. expirer. See Spirit.]

1. To breathe out; to emit from the lungs; to throw out from the mouth or nostrils in the process of respiration; -- opposed to inspire.

Anatomy exhibits the lungs in a continual motion of inspiring and expiring air. --Harvey.

This chafed the boar; his nostrils flames expire. --Dryden.

2. To give forth insensibly or gently, as a fluid or vapor; to emit in minute particles; to exhale; as, the earth expires a damp vapor; plants expire odors.

The expiring of cold out of the inward parts of the earth in winter. --Bacon.

3. To emit; to give out. [Obs.] --Dryden.

4. To bring to a close; to terminate. [Obs.]

Expire the term Of a despised life. --Shak.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Expire

Ex*pire"\, v. i. 1. To emit the breath.

2. To emit the last breath; to breathe out the life; to die; as, to expire calmly; to expire in agony.

3. To come to an end; to cease; to terminate; to perish; to become extinct; as, the flame expired; his lease expires to-day; the month expired on Saturday.

4. To burst forth; to fly out with a blast. [Obs.] "The ponderous ball expires." --Dryden.