mains
The domestic electrical power supply, especially as connected to a network or grid.
Example
“I plugged it into the mains and it blew up!”
Other meanings
A large-scale network or grid supplying any of various other services, such as water, gas or sewerage, to properties.
“We have gas heating, but it's bottled gas, not mains gas.”
The main course of a meal.
Where this comes from
This definition is adapted from “mains” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.