Avionics is the science of electronics used in aviation. the electronic equipment used in aircraft and the science of developing it (aviation + electronics)
All the electronic and electro-mechanical systems and subsystems (hardware and software) installed in an aircraft or attached to it Avionics systems interact with the crew or other aircraft systems in these functional areas: communications, navigation, weapons delivery, identification, instrumentation, electronic warfare, reconnaissance, flight control, engine control, power distribution, and support equipment
science and technology of electronic systems and devices for aeronautics and astronautics; "avionics has become even more important with the development of the space program