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strenuous
Definition: (adjective) requiring energy and strength.
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(

) KEY

PREPOSITION:

In every; to each; per: once a month; one dollar a pound.

ETYMOLOGY:
Middle English, from Old English an, in ; see on

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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
Published by the Houghton Mifflin Company. All rights reserved.
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