[eks-huh-ley-shuhn, ek-suh-]
the act of exhaling.
something that is exhaled; vapor; emanation.

1350–1400; Middle English exalacion < Latin exhālātiōn- (stem of exhālātiō). See exhale, -ation

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World English Dictionary
exhale (ɛksˈheɪl, ɪɡˈzeɪl)
1.  to expel (breath, tobacco smoke, etc) from the lungs; breathe out
2.  to give off (air, vapour, fumes, etc) or (of air, vapour, etc) to be given off; emanate
[C14: from Latin exhālāre to breathe out, from hālāre to breathe]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., from L. exhalationem, noun of action from exhalare (see exhale).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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

  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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American Heritage
Science Dictionary
exhalation   (ěks'hə-lā'shən)  Pronunciation Key 
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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Example sentences
Other tests require forced inhalation or exhalation after a deep breath.
Some are made without exhalation valves, making them particularly useful in certain health-care settings.
Exhalation resistance as with demand units is determined at maximum deflection ignoring the relief valve pressure spike.
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