Definitions
1.nounSomeone who couples things together, especially someone whose job it is to couple railway carriages.
2.nounAnything that serves to couple things together; but especially a device that couples railway carriages.
3.nounA device that connects two keyboards of an organ together so that they play together.
4.nounA device used to convert electronic information into audible sound signals for transmission over telephone lines.
5.nounAn electrical device used to transfer energy from one electric device to another, especially without a physical connection.