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"In science fiction one can say a great many things that are unpalatable, because it's expressed as science fiction you can slip it past their defenses."
- Frederik Pohl

Gravity Drive  
  A spaceship propulsion method that uses gravity or gravity waves.  

First use of this phrase.

None of them had ever built a rocketship, had ever seen one in action even. It was centuries obsolete in Galactic civilization. But gravity drives were out of the question. So - they'd had to design the ship from the ground up.
From Star Ship, by Poul Anderson.
Published by Planet Stories in 1950
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