MAINS

[plural] [noun] UKThe mains is the system of pipes or wires which carry water or electricity into a house, or the pipes which carry sewage away from a house.The house isn't on the mains.They bought a house with no mains supply.They have been lacking mains electricity for three weeks now.(UK) The mains is also 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.