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- DictionaryIn·ter·com/ˈin(t)ərˌkäm/
noun
- 1. an electrical device allowing one-way or two-way communication: "the pilot's voice comes over the intercom"
noun
Stand-alone voice communications system for use within a building or small collection of buildings, functioning independently of the public telephone network
An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. Intercoms are generally mounted permanently in buildings and vehicles, but can also be detachable and po... Wikipedia