Longman Dictionary of Contemporary English homepage

exhaustion

 noun
     
ex‧haus‧tion [uncountable]
1 extreme tiredness
with exhaustion
He collapsed with exhaustion.
Sheer exhaustion forced him to give up.
Many runners were suffering from heat exhaustion (=when you become tired and ill because you are too hot).
nervous exhaustion (=when you become ill because you have been working too hard or have been very worried)
2 when all of something has been used
exhaustion of
the exhaustion of oil supplies
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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