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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
1905-1910
1905-10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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