mechanical advantage

noun Mechanics.
the ratio of output force to the input force applied to a mechanism.

1890–95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mechanical advantage
the ratio of the working force exerted by a mechanism to the applied effort

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
mechanical advantage   (mĭ-kān'ĭ-kəl)  Pronunciation Key 
The ratio of the output force (acting on a load) produced by a machine to the applied effort (the input force). See also efficiency.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It can also help make other kinds of physical work easier by giving the user a mechanical advantage.
The players now can be taller because the clubs compensate and that has moved the mechanical advantage toward more height.
The choice of equipment determines mechanical advantage for this sport.
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