Definition of "delta-v" []

• A vector change in velocity, especially a small change as a result of a corresponding change in some other parameter (noun)
• The maximum change in the scalar speed of a rocket if the rocket were operated in a vacuum away from external forces (noun)
• A minimum scalar requirement for rocket delta-v to be able to achieve a particular manoeuvre (noun)

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• "For every space mission, manned or unmanned, transportation cost is a fraction of 10 to 30 %, depending on the delta-v requirements (the "distance" to be covered)."
• "If they were to develop a space-rated nuclear reactor, they would have all the pieces they need to build large ships on orbit with enough delta-v to go pretty much ANYWHERE."
• "Nevermind delta-v; you can teleoperate very complicated machines, with hands, on the Moon."