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English definition of “gear”

gear

noun (MACHINE PART)   /ɡɪr/
(in a machine) a wheel having pointed parts around the edge that come together with similar parts of other wheels to control how much power from an engine goes to the moving parts of a machine In a vehicle, a gear is any of several limited ranges of power that are used for different speeds: [U] Use second gear going up a steep hill.
(Definition of gear noun (MACHINE PART) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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