gravity-assist

gravity assist

noun
the technique of using the energy of a gravitational field and the orbital velocity of a planet to change the speed and trajectory of a spacecraft.
Also called gravitational slingshot.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
gravity-assist

noun
(spaceflight) a trajectory that passes close to a planetary body in order to gain energy from its gravitational field 
WordNet® 3.0, © 2006 by Princeton University.
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