the part of a piece of equipment, especially electrical equipment, into which another part fits

an electrical socket 电插座

a light socket 灯头

UK He had forgotten to plug the television into the mains socket. 他忘了把电视机插头插进墙上的插座里。

The air freshener plugs into a car's lighter socket. 空气清新器插头插在汽车点烟器插孔里。

a part of the body into which another part fits

a tooth/eye socket 牙槽／眼窝

a ball-and-socket joint like the hip joint 像髋关节似的球窝关节