1) Aviation velocity 2) Cockpit concern 3) Cockpit datum 4) Cockpit reading 5) How fast a plane is flying 6) Speed 7) Velocity 8) What machmeters measure 
Airspeed is the speed of an aircraft relative to the air. Among the common conventions for qualifying airspeed are: indicated airspeed (`IAS`), calibrated airspeed (`CAS`), true airspeed (`TAS`), equivalent airspeed (`EAS`) and density airspeed. The measurement and indication of airspeed is ordinarily accomplished on board an aircraft by a...
The speed of a flying object through the air, commonly used in reference to aircraft or canopies
[n] - the speed of an aircraft relative to the air in which it is flying
The speed of something relative to a mass of air or the speed of air relative to a fixed object. See also: Velocity.
The speed of a flying machine or airship relative to the air as distinct from its speed relative to the ground. Thus an aeroplane flying at 200 m.p.h. airspeed against a 50 m.p.h. headwind will have a ground speed of only 150 m.p.h.
noun the speed of an aircraft relative to the air in which it is flying
The speed of an aircraft relative to the air through which it is flying.
the forward speed of an aircraft relative to the air through which it moves.