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airspeed
This term is a technical specification used primarily in aviation to distinguish the speed of an aircraft relative to the surrounding air from its ground speed, which is the speed relative to a fixed point on the earth. It is a critical measurement for flight safety, as the lift generated by the wings depends on the flow of air over them rather than the distance covered over the ground.
In professional aeronautical contexts, this is often further categorized into indicated airspeed, true airspeed, and calibrated airspeed. Because it describes a specific physical measurement of velocity, it is treated as an uncountable mass noun in most technical and descriptive contexts.