ex·pi·ra·tion

[ek-spuh-rey-shuhn]
noun
1.
a coming to an end; termination; close: the expiration of a contract.
2.
the act of expiring, or breathing out; emission of air from the lungs.
3.
Archaic. death.

Origin:
1375–1425; late Middle English expiracioun < Latin expīrātiōn- (stem of expīrātiō), equivalent to expīrāt(us) (past participle of ex(s)pīrāre to expire) + -iōn- -ion

non·ex·pi·ra·tion, noun
pre·ex·pi·ra·tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Expiration is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a fool or simpleton; ninny.
Collins
World English Dictionary
expiration (ˌɛkspɪˈreɪʃən) [Click for IPA pronunciation guide]
 
n
1.  the finish of something; ending; expiry
2.  the act, process, or sound of breathing out
3.  rare a last breath; death

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

expiration
early 15c., "vapor, breath," from M.Fr. expiration, from L. expirationem (nom. expiratio), from expirare (see expire). Meaning "termination, end, close" is from 1560s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

expiration ex·pi·ra·tion (ěk'spə-rā'shən)
n.
See exhalation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
expiration   (ěk'spə-rā'shən)  Pronunciation Key 
See exhalation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
There is still no standardization but texts purchased online come with a
  six-month expiration date.
The preservative extends the expiration date from maybe being a few hours after
  removed from a refrigerator to weeks or months.
Some items are near or slightly past their sell-by dates, but these days,
  expiration won't keep shoppers from a discount.
The base of the lung descends during inspiration and ascends during expiration.
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