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English definition of “transformer”

transformer

noun [C]     /trænsˈfɔː.mər/ US  /-ˈfɔːr.mɚ/ specialized
a device that changes the voltage or other characteristic of electrical energy as it moves from one circuit to another: You may need a transformer if you want to run a personal stereo off mains electricity.Electrical components and circuitry
(Definition of transformer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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