[eks-heyl, ek-seyl]
verb (used without object), exhaled, exhaling.
to emit breath or vapor; breathe out.
to pass off as vapor; pass off as an effluence.
verb (used with object), exhaled, exhaling.
to breathe out; emit (air, vapor, sound, etc.): to exhale a sigh.
to give off as vapor: The engine exhaled steam.
to draw out as a vapor or effluence; evaporate.

1350–1400; Middle English exalen < Latin exhālāre, equivalent to ex- ex-1 + hālāre to breathe

unexhaled, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

c.1400, from M.Fr. exhaler, from L. exhalare "breathe out," from ex- "out" + halare "breathe." Related: Exhaled; exhaling.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

exhale ex·hale (ěks-hāl', ěk-sāl')
v. ex·haled, ex·hal·ing, ex·hales

  1. To breathe out.

  2. To emit a gas, vapor, or odor.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Breathe in deeply and make an effort to exhale all of the air out of your lungs
  through the tubing.
They will notice how air fills their lungs when they inhale and gets pushed out
  when they exhale.
There is beauty and logic in this progression: first you inhale, then you
Instead you want to try to take a deep breath and then exhale as you talk.
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