groundspeed

or ground speed

[ ground-speed ]
/ ˈgraʊndˌspid /

noun

the speed of an aircraft with reference to the ground.

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Origin of groundspeed

First recorded in 1915–20; ground1 + speed
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for groundspeed

groundspeed
/ (ˈɡraʊndˌspiːd) /

noun

the speed of an aircraft relative to the groundCompare 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