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gear ratio

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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 of gear ratio

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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