the forward speed of an aircraft relative to the air through which it moves.
Also, air speed.
Compare groundspeed.

1905–10; air1 + speed Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To airspeed
World English Dictionary
airspeed (ˈɛəˌspiːd)
Compare groundspeed the speed of an aircraft relative to the air in which it moves

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Conflicting airspeed readings led to a major catastrophe.
Special tests of airspeed instruments can be arranged.
The recording airspeed and altimeter are connected to the airspeed head on the
  vertical fin.
Fuel-flow rate is independent of airspeed and thrust for aircraft with piston
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