American English

Definition of exertion noun from the Oxford Advanced American Dictionary



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  1. 1[uncountable] exertions [plural] physical or mental effort; the act of making an effort She was hot and breathless from the exertion of riding her bike uphill. He needed to relax after the exertions of a busy day at work.
  2. 2[singular] the use of power to make something happen the exertion of force/strength/authority It requires no great exertion of the imagination to recognize the truth of this.
See the Oxford Advanced Learner's Dictionary entry: exertion