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gear ratio

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gear ratio

–noun Machinery.
1. the ratio of the rotational speeds of the first and final gears in a train of gears or of any two meshing gears.
2. the ratio of the diameters of the pitch surfaces of any two meshing gears or of the numbers of their teeth.

Origin:
1905–10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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gear ratio  
n.  The ratio of the speed of rotation of the powered gear of a gear train to that of the final or driven gear.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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