the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. The act of exerting; the act of putting into motion or action; effort; a striving: as, an exertion of strength or power; an exertion of the limbs or of the mind.
n.Synonyms Endeavor, attempt, trial.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. use of physical or mental energy; hard work
"Hence he has found it practically the greatest economy of mental labor to work vigorously when he is disposed to do so, and to refrain from exertion, so far as possible, _when it is felt to be an exertion_. ""
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