the speed of an aircraft with reference to the ground.
Also, ground speed.

1915–20; ground1 + speed Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
groundspeed (ˈɡraʊndˌspiːd)
Compare airspeed the speed of an aircraft relative to the ground

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
The airplane will reach critical engine failure indicated airspeed at a lower groundspeed.
Corrects for and records the differences between preflight groundspeed and heading calculations and those determined en-route.
When there is wind, groundspeed is not identical to airspeed.
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