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noun. 1  1mass noun A system for transmitting messages from a distance along a wire, especially one creating signals by making and breaking an electrical connection. ânews came from the outside world by telegraphâ. 2  2A board displaying scores or other information at a sports match or race meeting.
The word telegraph was first coined by the French inventor of the Semaphore line, Claude Chappe, who also coined the word semaphore. A telegraph is a device for transmitting and receiving messages over long distances, i.e., for telegraphy. The word telegraph alone now generally refers to an electrical telegraph. Wireless telegraphy is also known as CW, for continuous wave (a carrier modulated by on-off keying), as opposed to the earlier radio technique of using a spark gap.