Full record for zero-gravity n.

Definition the state or condition in which there is no apparent force of gravity acting on a body, either because the force is locally weak, or because both the body and its surroundings are freely and equally accelerating under the force
OED requirements antedating 1938
Earliest cite 1938 J. Binder 'If Science Reached The Earth's Core'
Comment Mike Christie submitted a 1938 cite from Jack Binder's "If Science Reached The Earth's Core". Earliest cite in the OED: 1951.
Last modified 30 July, 2019

Citations for zero-gravity n.

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1938 J. Binder If Science Reached Earth's Core in Thrilling Wonder Stories Oct. 99 Starting at the zero-gravity of earth's core, accumulative acceleration is easily built up in a four-thousand-mile tube.
1979 A. C. Clarke Fountains of Paradise 169 A space-station assembly supervisor, accustomed to working under zero gravity, had forgotten that though he was in space he was not in orbit–and a lifetime's experience had betrayed him.
1985 O. S. Card Ender's Game iii. 24 Day after day, in zero gravity, there are mock battles.
1994 Analog Science Fiction & Fact Jan. 187/2 About a decade ago, discussion of space-station experiments shifted terminology from ‘zero-gravity’ to ‘microgravity.’