1. something that leads in or introduces; introduction; opening.
  2. Radio, Television.
    1. the connection between an antenna and a transmitter or receiving set.
    2. the portion of a program or script that precedes or introduces a commercial.


  1. (of a conductor) carrying input to an electric or electronic device or circuit, especially from an antenna.


    1. an introduction to a subject
    2. (as modifier)a lead-in announcement
  1. the connection between a radio transmitter, receiver, etc, and the aerial or transmission line

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