Dictionary
ex•er•tion
Pronunciation: (ig-zûr'shun), [key]—
n.
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.