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English definition of “relay”

relay

noun [C] (EQUIPMENT)    /ˈriː.leɪ/
a device that reacts to a small change in an electrical current by moving switches or other devices in an electrical circuit Electrical components and circuitryCommunications technology - general words
(Definition of relay noun (EQUIPMENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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