gear-ratio

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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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