Origin: Latin prefix inter-
Intercom has 3 different meanings across 1 category:
a communication system linking different rooms within a building or ship etc
"The hotel concierge used the intercom to announce room service delivery to every floor simultaneously."
an electronic communication system, especially one between rooms in a building
"I used the intercom to ask the person in the next office if they needed help moving that heavy box."
To communicate (with) by intercom.
"I used the intercom to announce that dinner would be ready in ten minutes."