WordReference Random House Unabridged Dictionary of American English © 2026
ze′ro grav′ity, [Physics.]
  1. Physicsthe condition in which the apparent effect of gravity is zero, as in the case of a body in free fall or in orbit.
Also, ze•ro-g, ze•ro-G  (zēr′ō jē′).USA pronunciation 
  • 1950–55

Collins Concise English Dictionary © HarperCollins Publishers::
zero gravity, zero-G n
  1. the state or condition of weightlessness
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