socket UK /ˈsɒkɪt/US /ˈsɑkɪt/noun 10verb 1forms 3 noun10 •Any of various concave objects (or portions of larger objects) that envelop a counterpart object. •An opening into which a plug or other connecting part is designed to fit (e.g. a light bulb socket).Each seat must have a 230V socket, a USB socket, a coat hook, reading light and cup holder. — 2021 •A hollow into a bone which a part fits, such as an eye, or another bone, in the case of a joint. •The socket head for a socket wrench. •A hollow tool for grasping and lifting tools dropped in a well-boring. •The hollow of a candlestick.The candle burned to its socket, the fire went out, the night air grew heavy with silence, before Herbert lay down. — 1856 •One endpoint of a two-way communication link, used for interprocess communication across a network. •One endpoint of a two-way named pipe on Unix and Unix-like systems, used for interprocess communication. •(slang, vulgar) The vagina. •A steel apparatus attached to a saddle to protect the thighs and legs. verb1 •To place or fit in a socket. formssocketed · socketing · sockets