Gravity-assist
noun
1.
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.
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noun 1. a clock driven by its own weight as it descends a rack, cord, incline, etc.
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noun, Horology. 1. an escapement, used especially in large outdoor clocks, in which the impulse is given to the pendulum by means of a weight falling through a certain distance.
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noun 1. a dam resisting the pressure of impounded water through its own weight. noun 1. a dam whose weight alone is great enough to prevent it from tipping over