weightless

[weyt-lis]
adjective
being without apparent weight, as a freely falling body or a body acted upon by a force that neutralizes gravitation.

Origin:
1540–50; weight + -less

weightlessly, adverb
weightlessness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
weightless (ˈweɪtləs)
 
adj
1.  (of a body) having no actual weight; a state in which an object has no actual weight (because it is in space and unaffected by gravitational attraction) or no apparent weight (because the gravitational attraction equals the centripetal force and the object is in free fall)
2.  commerce
 a.  (of economic activity) based on the supply of information and ideas rather than trade in physical goods: the weightless economy
 b.  (of a company) having very few physical assets: weightless dot.coms
 
'weightlessness
 
n

weightlessness (ˈweɪtlɪsnɪs)
 
n
a state in which an object has no actual weight (because it is in space and unaffected by gravitational attraction) or no apparent weight (because the gravitational attraction equals the centripetal force and the object is in free fall)
 
'weightless
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

weightlessness

condition experienced while in free-fall (q.v.), in which the effect of gravity is canceled by the inertial (e.g., centrifugal) force resulting from orbital flight. The term zero gravity is often used to describe such a condition. Excluding spaceflight, true weightlessness can be experienced only briefly, as in an airplane following a ballistic (i.e., parabolic) path

Learn more about weightlessness with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
In the weightlessness of space, that drawback is gone.
The study looks at how muscles deteriorate during extended weightlessness.
The sensation of calm weightlessness reminded me of scuba diving.
After injection into orbit, when the carrier rocket was separated, a state of
  weightlessness began.
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