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Definition of Zero gravity
1. Noun. The state of apparent weightlessness which occurs in a very low gravity field, or in free fall. ¹
¹ Source: wiktionary.com
Medical Definition of Zero gravity
1. A physical state existing in space or at a time in flight when the centrifugal thrust of a parabolic glide or turn exactly counteracts the force of gravity. (05 Mar 2000)