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  1. Noun.  An intercom system fitted at the entrance to a building, especially a block of flats, by which visitors can identify themselves to specific occupants before being admitted to the building.
  2. Noun.  a An intercom system which enables someone, without opening the door, to converse with the person who has rung the doorbell..

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This entry was last updated on RefTopia from its source on 3/20/2012.