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circuit

noun [C] (CLOSED SYSTEM)
 
 
/ˈsɜː.kɪt/ US  /ˈsɝː-/

Definition

C2 a closed system of wires or pipes through which electricity or liquid can flow: A defect was found in the water-cooling/electrical circuit.Electrical components and circuitry
(Definition of circuit noun (CLOSED SYSTEM) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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