Telegraphy

n. installation and operation of telegraph systems

Telegraphy (from the Greek words (τηλη) = far and (γραφειν) = write) is the long-distance transmission of written messages without physical transport of letters, originally by changing something that could be observed from a distance (optical telegraphy). Radiotelegraphy or wireless telegraphy transmits messages using radio. Telegraphy includes recent forms of data transmission such as fax, email, and computer networks in general. (A telegraph is a machine for transmitting and receiving messages over long distances, i.e., for telegraphy. The word telegraph alone 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 using a spark gap).
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Noun
1. communicating at a distance by electric transmission over wire
(hypernym) telecommunication, telecom
(class) cable, telegraph, wire
2. apparatus used to communicate at a distance over a wire (usually in Morse code)
(synonym) telegraph
(hypernym) apparatus, setup

(n.)
The science or art of constructing, or of communicating by means of, telegraphs; as, submarine telegraphy.
  

A form of telecommunication which is concerned in any process providing transmission and reproduction at a distance of documentary matter, such as written or printed matter or fixed images, or the reproduction at a distance of any kind of information in such a form. For the purposes of the Radio Regulations , unless otherwise specified therein, telegraphy shall mean a form of telecommunication for the transmission of written matter by the use of a signal code. [NTIA] [RR]