Longman Dictionary of Contemporary English homepage

exertion

 noun
     
ex‧er‧tion [uncountable and countable]
1 a lot of physical or mental effort:
The afternoon's exertions had left us feeling exhausted.
mental exertion
2 the use of power, influence etc to make something happen:
the exertion of authority
Definition from the Longman Dictionary of Contemporary English
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