exertion

[ig-zur-shuhn]
noun
1.
vigorous action or effort: physical and mental exertion.
2.
an effort: a great exertion to help others.
3.
exercise, as of power or faculties.
4.
an instance of this.

Origin:
1660–70; exert + -ion

nonexertion, noun
self-exertion, noun
superexertion, noun


1. endeavor, struggle, attempt, activity, strain. See effort.
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World English Dictionary
exert (ɪɡˈzɜːt)
 
vb
1.  to use (influence, authority, etc) forcefully or effectively
2.  to apply (oneself) diligently; make a strenuous effort
 
[C17 (in the sense: push forth, emit): from Latin exserere to thrust out, from ex-1 + serere to bind together, entwine]
 
ex'ertion
 
n
 
ex'ertive
 
adj

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

exertion
1660s, from exert + -ion.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In this hour of reckoning, thin air and night silence fuse with exertion,
  exhilaration and lack of sleep.
The job didn't require a lot of mental exertion, but I was on my feet a lot.
Despite the workout your thumbs get, I didn't think playing video games
  involved much physical exertion.
Each volunteer's heart function was measured before exercise and at peak
  exertion on a treadmill.
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