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commutator

noun [C]
 
 
/ˈkɒm.jʊ.teɪ.tər/ US  /ˈkɑː.mjə.teɪ.t̬ɚ/ specialized

Definition

a device used in some types of electric motors to change the direction in which an electric current is flowingElectrical components and circuitry
(Definition of commutator noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of commutator