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  1. Dictionary

    tel·e·graph
    [ˈteləˌɡraf]
    noun
    telegraph (noun) · telegraphs (plural noun)
    1. a system for transmitting messages from a distance along a wire, especially one creating signals by making and breaking an electrical connection:
      "news came from the outside world by telegraph"
      • a device for transmitting messages by telegraph.
    verb
    telegraph (verb) · telegraphs (third person present) · telegraphed (past tense) · telegraphed (past participle) · telegraphing (present participle)
    1. send (someone) a message by telegraph:
      "I must go and telegraph Mom"
    Origin
    late 18th century: from French télégraphe, from télé- ‘at a distance’ + -graphe (see -graph).
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    Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas pigeon post is not.
    en.wikipedia.org
    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 transmission of messages over radio with telegraphic codes.
    en.wikipedia.org
    The earliest true telegraph put into widespread use was the optical telegraph of Claude Chappe, invented in the late 18th century. The system was used extensively in France, and European nations occupied by France, during the Napoleonic era. The electric telegraph started to replace the optical telegraph in the mid-19th century.
    en.wikipedia.org