an electronic communication system, especially one between rooms in a building
‘emergency intercom’; ‘talk on the intercom’;
An intercom system which enables someone, without opening the door, to converse with the person who has rung the doorbell.
(ambitransitive) To communicate (with) by intercom.
a communication system linking different rooms within a building or ship etc
An intercom () or interphone is a stand-alone voice communications system for use within a building or small collection of buildings, functioning independently of the public telephone network. Intercoms are generally mounted permanently in buildings and vehicles.