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English definition of “pinion”

pinion

noun [C]     /ˈpɪn.jən/
a small wheel with teeth-like parts around its edge that fit against similar parts on a larger wheel or a rack (= bar with teeth-like parts): a rack-and-pinion assemblyMachine parts
(Definition of pinion noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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