Plain English Meaning
The different kinds of ice that can build up on an airplane while flying, where each kind forms differently and causes a different problem.
Full Definition
A category covering the different forms of ice that can accumulate on an aircraft in flight, primarily structural icing (rime, clear, and mixed), induction icing (carburetor and air intake), and instrument icing (pitot, static port, and antenna). Each type forms under specific temperature and and affects the aircraft in distinct ways, including added , disrupted , engine air, and erroneous instrument readings.