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English definition of “circuit”

circuit

noun [C]  /ˈsɜr·kət/ us  

circuit noun [C] (CLOSED SYSTEM)

physics a closed system esp. of wires through which electricity can flow: Big electronic circuits can carry huge amounts of data. A circuit is also a system that allows people to communicate with each other: Holiday phone calls always overload the circuits.

circuit noun [C] (CIRCLE)

something shaped like a circle, esp. a route, path, or sports track that starts and ends in the same place: She has ridden on tough racing circuits such as the New York and Florida tracks. A circuit can be a path or route in the shape of a circle: Fish swam continuously, making the endless circuit of the tank.

circuit noun [C] (SERIES)

a regular series of events that happen in different places: She has won a number of tournaments on this year’s tennis circuit.

circuit noun [C] (LEGAL AREA)

an area under the authority of a particular court
circuitry
noun [U]  /ˈsɜr·kə·tri/ us  
the connected arrangement of the wires and other parts of a closed system through which electricity can flow: The circuitry in this computer is protected from power surges.
(Definition of circuit from the Cambridge Academic Content Dictionary © Cambridge University Press)
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