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groundspeed

[ground-speed] /ˈgraʊndˌspid/
noun
1.
the speed of an aircraft with reference to the ground.
Also, ground speed.
Origin
1915-1920
1915-20; ground1 + speed
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ground speed

groundspeed

/ˈɡraʊndˌspiːd/
noun
1.
the speed of an aircraft relative to the ground Compare airspeed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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