Wikipedia
In aeronautics, the relative wind is the direction of movement of the atmosphere relative to an aircraft or an airfoil. It is opposite to the direction of movement of the aircraft or airfoil relative to the atmosphere. Close to any point on the surface of an aircraft or airfoil, the air is moving parallel to the surface; but at a great distance from the aircraft or airfoil the movement of the air can be represented by a single vector. This vector is the relative wind or the free stream velocity vector.
The angle between the chord line of an airfoil and the relative wind defines the angle of attack. The relative wind is of great importance to pilots because exceeding the critical angle of attack will result in a stall, regardless of airspeed.
Usage examples of "relative wind".
A severe encounter with a vertical gust within the storm tore a long strip of fabric from the ventral surface of the lifting body, and it snapped and writhed in the relative wind like a giant's pennant.
Survival would be impossible if relative wind velocity of that strength were felt.
If it opened and partially came off the hinge, so it wasn't aligned with the fuselage anymore, and if it, say, was cocked fifty degrees to the relative wind .