delta-v

Etymology

From delta (“change”) +‎ v (“velocity”).

Noun

delta-v (plural delta-vs)

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