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New American Oxford Dictionary

delta-v

del ta-v (also delta-vee ) ▶noun informal acceleration: four hundred knots of delta-v. ORIGIN late 20th cent.: from delta 1 (as a mathematical symbol denoting variation ) + v for velocity .

 

Oxford Dictionary

delta-v

delta-v (also delta-vee ) ▶noun [ mass noun ] informal acceleration: four hundred knots of delta-v. ORIGIN late 20th cent.: from delta 1 (as a mathematical symbol denoting variation ) + v for velocity .