Definitions from Wiktionary (delta-v)

▸ noun:  (physics) A vector change in velocity, especially a small change as a result of a corresponding change in some other parameter.
▸ noun:  (astronautics) The maximum possible change in the scalar speed of a rocket or other vehicle if operated in a vacuum away from external forces.
▸ noun:  (astronautics) The minimum scalar change in speed required to perform a particular manoeuvre.




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