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exhalation

[eks-huh-ley-shuh n, ek-suh-] /ˌɛks həˈleɪ ʃən, ˌɛk sə-/
noun
1.
the act of exhaling.
2.
something that is exhaled; vapor; emanation.
Origin
1350-1400
1350-1400; Middle English exalacion < Latin exhālātiōn- (stem of exhālātiō). See exhale, -ation
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for ex halation

exhalation

n.

late 14c., from Latin exhalationem (nominative exhalatio), noun of action from past participle stem of exhalare (see exhale).

Online Etymology Dictionary, © 2010 Douglas Harper
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ex halation in Medicine

exhalation ex·ha·la·tion (ěks'hə-lā'shən, ěk'sə-)
n.

  1. The act or an instance of breathing out. Also called expiration.

  2. The giving forth of gas or vapor.

  3. Something, such as air or vapor, that is exhaled.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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ex halation in Science
exhalation
  (ěks'hə-lā'shən)   
The act of breathing out air. During exhalation, the diaphragm relaxes and moves upward, causing compression of the lungs and an outward flow of air. Also called expiration. Compare inhalation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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