socket

However many people it takes to change a light bulb, at least one of them will have to unscrew the old bulb from the socket and replace it with a new one. A hollow or cavity that you insert something into is a socket.

Many people also call electrical outlets (like the one you plug a toaster into) sockets. This makes sense because you are inserting a plug into it—some purists argue that it has to be called an outlet because power comes out of it, but it's a perfectly good way to use the word. There are also anatomical sockets in our bodies, like eye sockets into which eyeballs fit neatly, and ball-and-socket joints, like hips and shoulders.

Definitions of socket
  1. noun
    a receptacle into which an electric device can be inserted
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    types:
    electric socket
    a socket into which a lightbulb can be inserted
    type of:
    receptacle
    an electrical (or electronic) fitting that is connected to a source of power and equipped to receive an insert
  2. noun
    receptacle where something (a pipe or probe or end of a bone) is inserted
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    type of:
    receptacle
    a container that is used to put or keep things in
  3. noun
    a bony hollow into which a structure fits
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    types:
    hip socket
    the socket part of the ball-and-socket joint between the head of the femur and the innominate bone
    alveolus, tooth socket
    a bony socket in the alveolar ridge that holds a tooth
    acetabulum, cotyloid cavity
    the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint
    type of:
    bodily cavity, cavity, cavum
    (anatomy) a natural hollow or sinus within the body
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