Aileron—The outer edge or tip of a wing, usually adjustable, used to balance or stabilize.
Airship—Commonly used to denote both heavier and lighter than air machines; correctly a dirigible balloon.
Angle of Incidence—The angle of the wing with the line of travel.
Area—In the case of wings, the extent of surface measured on both the upper and lower sides. An area of one square foot comprises the actual surface of two square feet.
Aspect Ratio—The proportion of the chord to the span of a wing. For example if the wing has a span of 30 inches and a chord of 6 inches the aspect ratio will be 5 or span / chord.
Automatic Stability—Stability secured by fins, the angle of the wings and similar devices.
Aviator—One engaged in Aviation.
Aviation—The science of heavier than air machines.
Angle of Blade—The angle of the blade of a propeller to the axis of the shaft.
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