The speed of an aircraft relative to the atmosphere through which it is moving, based on an indicated value adjusted for effects such as wind direction, air temperature, and atmospheric pressure.
Origin
1920s; earliest use found in Journal of the Royal Aeronautical Society.
Definition of true airspeed in US English:
true airspeed
noun
Aeronautics
The speed of an aircraft relative to the atmosphere through which it is moving, based on an indicated value adjusted for effects such as wind direction, air temperature, and atmospheric pressure.
Origin
1920s; earliest use found in Journal of the Royal Aeronautical Society.