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intercommunication system

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noun
  1. a communication system within a building, ship, airplane, local area, etc., with a loudspeaker or receiver for listening and a microphone for speaking at each of two or more points.
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Origin of intercommunication system

First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018