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relay

noun [C] (EQUIPMENT)
 
 
/ˈriː.leɪ/

Definition

a device that reacts to a small change in an electrical current by moving switches or other devices in an electrical circuitElectrical 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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