What is the aspect ratio of a wing defined as?

The aspect ratio of a wing is defined as the ratio of the wingspan to the mean chord, which is indeed the correct understanding of this aerodynamic concept. In more detail, the wingspan is the distance from one wingtip to the other, while the mean chord represents the average width of the wing across its span. The aspect ratio is a crucial factor in aerodynamics because it influences the lift characteristics and performance of the aircraft. A higher aspect ratio generally signifies a more efficient wing design, which can lead to improved lift-to-drag ratios and better flight performance, especially in gliders and long-winged aircraft.

Understanding the aspect ratio is essential for pilots and aeronautical engineers as it directly relates to the wing’s aerodynamic efficiency and overall handling characteristics. The other definitions provided do not accurately represent the established aerodynamic definition of aspect ratio.