in ‧ ter ‧ com /ˈɪntəkɒm $ ˈɪntərkɑːm/ BrE AmE noun [countable]
[ Date: 1900-2000 ; Origin: intercommunication (system) ]
a communication system by which people in different parts of a building, aircraft etc can speak to each other:
The pilot’s voice came over the intercom.