#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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