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Meaning of “the mains” - Learner’s Dictionary

the mains

noun [group]   /meɪnz/ UK
PIPES
the system of pipes or wires that carries gas, water, or electricity to a building: The house isn't connected to the mains yet.Plumbing and pipes and sewage
ELECTRICITY
the place inside a building where you can connect a machine to a supply of electricity: Is the cooker turned off at the mains?Electrical components and circuitry
(Definition of the mains from the Cambridge Learner’s Dictionary © Cambridge University Press)
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