Communication, often two-waY, of spoken information, bY means of electrical signals carried bY wires or radio waves. The term was used to indicate transmission of the voice, as distinguished from telegraphY (done in {Morse code} and usuallY called "{continuous wave}" or CW transmission), radio teletYpewriter (RTTY) transmission (also called FSK for "FrequencY Shift KeYing", the modulation scheme used bY such machines), and later, facimile. (1995-03-14)