What aerodynamics term describes the acute angle between an airfoil's chord line and the relative wind?

The acute angle between an airfoil's chord line and the relative wind is referred to as the angle of attack. This angle is crucial in aerodynamics as it directly influences the lift generated by the airfoil. When the angle of attack increases, lift typically increases as well, up to a certain point.

At low angles, the airflow remains attached to the wing, enabling effective lift generation. However, it's important to note that if the angle of attack increases too much, it can lead to airflow separation and loss of lift, resulting in a stall. Understanding this relationship helps in optimizing aircraft performance and safety during various flight maneuvers.