| the condition in which the apparent effect of gravity is zero, as in the case of a body in free fall or in orbit. |
[zeer-oh-jee] 
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| zero gravity
The condition of real or apparent weightlessness occurring when any gravitational forces acting on a body meet with no resistance so the body is allowed to accelerate freely. Bodies in free fall (including trajectories like orbits) experience zero gravity; bodies at rest on the Earth's surface do not, since they are subject to the counterforce of the surface supporting them. |