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A condition of apparent or real weightlessness such as that experienced in orbit or in free fall, or in a region lacking a gravitational field.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(General Physics) the state or condition of weightlessness
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the condition in which the apparent effect of gravity is zero, as on a body in free fall or in orbit.Also called ze•ro-g, ze•ro-G (ˈzɪər oʊˈdʒi)
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
The condition of apparent weightlessness occurring when a body in a gravitational field moves in such a way as to counterbalance its gravitational force. For example, astronauts orbiting Earth in a shuttle or space station experience zero gravity because the spacecraft continually accelerates in its orbit in order to prevent it from being pulled into the atmosphere. This acceleration, which is often referred to as a centrifugal force, counterbalances gravity exactly.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.