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English definition of “main”

main

noun (PIPE)    /meɪn/
[C] a large pipe that carries water or gas , or a wire carrying electricity , from one place to another, to which a house can be connected : a gas main The severe cold caused a water main to burst and flood the street .Plumbing and pipes and sewageElectrical components and circuitry mains [plural] UK the system of pipes or wires that carry water or electricity into a house , or the pipes that carry sewage away from a house : The house isn't on the mains. They bought a house with no mains supply . mains electricity Plumbing and pipes and sewageElectrical components and circuitry the mains UK the place at which outside pipes or wires carrying water , electricity , etc. connect with the system inside a house or building : Switch off the electricity at the mains before starting work .Plumbing and pipes and sewageElectrical components and circuitry
(Definition of main noun (PIPE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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