This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An electronic intercommunication system, as between two rooms.

n. an electronic communication system, especially one between rooms in a building

n. a communication system linking different rooms within a building or ship etc

"I'm hollering to Royal to go but there's so much noise that nobody can hear anything plus Royal's intercom is no longer connected."

communication system   

interphone   

comm    communicator    stereo-    telephone    transceiver    wireless    microphone    headset    override    cordless