a hollow part or piece for receiving and holding some part or thing.

Electricity .

a device intended to hold an electric light bulb mechanically and connect it electrically to circuit wires.

Also called wall socket. a socket placed in a wall to receive a plug that makes an electrical connection with supply wiring.

Anatomy .

a hollow in one part that receives another part

the socket of the eye.

the concavity of a joint

the socket of the hip.

to place in or fit with a socket.