the act or process of exhausting.
the state of being exhausted.
extreme weakness or fatigue.
the total consumption of something: the exhaustion of your vacation benefits for the year.

1640–50; < Neo-Latin exhaustiōn- (stem of exhaustiō). See exhaust, -ion

preexhaustion, noun

3. weariness, lassitude.
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World English Dictionary
exhaustion (ɪɡˈzɔːstʃən)
1.  extreme tiredness; fatigue
2.  the condition of being used up; consumption: exhaustion of the earth's resources
3.  the act of exhausting or the state of being exhausted

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"fatigue," 1640s, from exhaust in sense of "drawing off" of strength.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

exhaustion ex·haus·tion (ĭg-zôs'chən)

  1. The inability to respond to stimuli; extreme fatigue.

  2. The act or an instance of using up a supply of something.

  3. The extraction of the active constituents of a drug by treating with water, alcohol, or another solvent.

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 for exhaustion
Throughout the fall and winter, his health faltered mainly through exhaustion.
Some ancient sources claim he died from exhaustion at the age of thirty.
On one such flight, yeager did an emergency landing as a result of fuel exhaustion.
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