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groundbait
groundbreaking
groundburst
grounded
grounder
groundhog
Groundhog Day
grounding
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ground speed
ground speed (plural ground speeds)


noun 
Definition:
 
aircraft's speed relative to ground: the speed of a flying aircraft measured in relation to the ground it is traveling over and used for calculating flight times
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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