1.An opening into which anything is fitted; any hollow thing or place which receives and holds something else; as, the sockets of the teeth. "His eyeballs in their hollow sockets sink."
2.Especially, the hollow tube or place in which a candle is fixed in the candlestick.
3.(Electricity) The receptacle of an electric lamp into which a light bulb is inserted, containing contacts to conduct electricity to the bulb.
4.(Electricity) The receptacle fixed in a wall and connected by conductive wiring to an electrical supply, containing contacts to conduct electricity, and into which the plug of an electrical device is inserted; called also a wall socket or outlet. The socket will typically have two or three contacts; if three, the third is connected to a ground for safety. "And in the sockets oily bubbles dance."