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Delta-vee (or Δv) was the change in velocity of a spaceship or other stellar object to escape gravitational forces. The term was usually synonymous with a ship's capability of changing its course in different maneuvers until all its power was depleted.

The 22nd century starship SS Mariposa could achieve a delta-vee of 3.7e7×107 NVP. (TNG: "Up The Long Ladder")

In 2366, when the crew of the USS Enterprise-D tried to restore the orbit of Bre'el IV's moon, a delta-vee of four kilometers per second were needed. Due to the moon's large mass, the Galaxy-class vessel was only capable of producing a delta-vee of ninety two meters per second and were not able to produce that speed increase in time even with powering up the tractor beam and exceeding the recommended impulse engine's power limit by 47%. (TNG: "Deja Q")

According to an unused okudagram, the 21st century NASA spacecraft Charybdis had a delta-vee of 7.44e3×103 NVP. (Star Trek: The Next Generation - The Continuing Mission)

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