What is the definition of biplane?

Answer 1

A biplane is an aircraft that has two wings stacked one above the other. This design contrasts with a monoplane, which has only one wing. Biplanes were commonly used in the early years of aviation, as their configuration provides increased lift and structural rigidity, allowing for smaller wings and a lighter frame. Biplanes are often characterized by their characteristic "biplane" structure, utilizing bracing wires and struts to support the wings. While they are less common in modern aviation, biplanes are still used for certain types of aircraft, including vintage planes, aerobatic aircraft, and crop dusters.