From The Collaborative International Dictionary of English v.0.48 [gcide]:
Exertion \Ex*er"tion\, noun The act of exerting, or putting into motion or action; the active exercise of any power or faculty; an effort, esp. a laborious or perceptible effort; as, an exertion of strength or power; an exertion of the limbs or of the mind; it is an exertion for him to move, to-day.
From WordNet (r) 3.0 (2006) [wn]:
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