Definition
An internal voice communication system that allows the pilot, instructor, and any passengers in an aircraft to speak to and hear each other through headsets, separate from the radios used to talk to air traffic control or other aircraft.
Plain English
A wired headset system inside the aircraft so the people on board can talk to each other clearly over the noise of the engine and wind.
Context Anchor
Commonly used during flight training so the instructor and student can communicate clearly while the engine, airflow, and other cockpit sounds are loud.
Derivation
From 'inter' (between) and 'communication.' It is the system that handles communication between people inside the aircraft, as distinct from communication with anyone outside it.
Why Pilots Care
Clear internal communication supports instruction, coordination, and safety when external noise would otherwise prevent effective conversation.
Intuition Check
Do not confuse the intercom system with the aircraft radio. The intercom is mainly for talking inside the aircraft; the radio is for talking outside the aircraft, such as to air traffic control or other pilots.
Example Sentence 1
Before takeoff, the instructor checked that both headsets were working on the intercom system.
Example Sentence 2
Passengers heard the pilot's weather update through the intercom system shortly after takeoff.