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zero gravity

noun, Physics.
1.
the condition in which the apparent effect of gravity is zero, as in the case of a body in free fall or in orbit.
Also, zero-g, zero-G
[zeer-oh-jee] /ˈzɪər oʊˈdʒi/ (Show IPA)
.
Origin
1950-1955
1950-55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for zero-gravity

zero gravity

noun
1.
the state or condition of weightlessness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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zero-gravity in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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