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Definition of Delta-v
1. Noun. (physics) A vector change in velocity, especially a small change as a result of a corresponding change in some other parameter ¹
2. Noun. (context: astronautics) the maximum change in the scalar speed of a rocket if the rocket were operated in a vacuum away from external forces ¹
3. Noun. (context: astronautics) a minimum scalar requirement for rocket delta-v to be able to achieve a particular manoeuvre ¹
¹ Source: wiktionary.com