exertion

Exertion is defined as physical or mental effort, or to the use of force or influence.

(noun)

  1. Doing an extremely hard crossword puzzle that taxes your brain is an example of mental exertion.
  2. When you exercise your authority and forbid someone from going to a party, this is an example of an exertion of your authority.

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See exertion in Webster's New World College Dictionary

noun

  1. the act, fact, or process of exerting; active use of strength, power, etc.; exercise
  2. energetic activity; effort

See exertion in American Heritage Dictionary 4

noun
The act or an instance of exerting, especially a strenuous effort.

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exertion

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