telegraphy

Communication by means of the telegraph.

The art or practice of communicating intelligence by a telegraph; the science or art of constructing or managing telegraphs.

The science or art of constructing, or of communicating by means of, telegraphs.

communication at a distance by means of the telegraph, either over wires or by wireless telegraphy, usually using Morse code

the apparatus and techniques used in such a system

apparatus used to communicate at a distance over a wire (usually in Morse code)

communicating at a distance by electric transmission over wire