Aeroplane
Not to be too picky, but the dictionary definitions of the words "aeroplane" and "airplane" are just that - definitions of the word. They describe the machine, not the functionality of the machine.
Without an effective three-axis control system, an aeroplane would not be functional.
I see the remarkably efficient Wright propeller as Wilbur and Orville Wrights' second great achievement. Their design came at a time when many people still wrongly thought of aerial propellers as essentially the same as a ship's propeller.