#medium an intervening substance through which signals can travel as a means for communication
supertype: communicating__communication the activity of communicating
subtype: aether__ether a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves
subtype: airwave__air medium for radio and television broadcasting; "the program was on the air from 9 til midnight"; "the president used the airwaves to take his message to the people"
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