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English definition of “ground speed”

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ground speed

noun [C usually singular] uk   specialized us  
An aircraft's ground speed is its speed when measured against the ground rather than the air through which it moves.
Translations of “ground speed”
in Chinese (Traditional) 地速(指飛機飛行時相對於地面的水準速度)…
in Chinese (Simplified) 地速(指飞机飞行时相对于地面的水平速度)…
(Definition of ground speed from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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