Plain English Meaning
The radio gear in the aircraft that lets the pilot talk to controllers and other pilots, and hear them back.
Full Definition
The radios and related avionics installed in an aircraft that allow the pilot to talk with air traffic control, other aircraft, and ground stations. In civil aviation this primarily means VHF transceivers operating in the aviation voice band, along with audio panels, microphones, headsets, and speakers that route and control the audio.
Context Anchor
Seen when describing aircraft systems, cockpit equipment, preflight checks, and communication between the aircraft and people on the ground or in other aircraft.