Definitions from Wiktionary (coupler)

▸ noun:  (now rare) Someone who couples things together, especially someone whose job it is to couple railway carriages.
▸ noun:  Anything that serves to couple things together; but especially a device that couples railway carriages.
▸ noun:  (music) A device that connects two keyboards of an organ together so that they play together.
▸ noun:  A device used to convert electronic information into audible sound signals for transmission over telephone lines.
▸ noun:  An electrical device used to transfer energy from one electric device to another, especially without a physical connection.
▸ Also see coupler




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