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[weyt-lis] /ˈweɪt lɪs/
being without apparent weight, as a freely falling body or a body acted upon by a force that neutralizes gravitation.
1540-50; weight + -less
Related forms
weightlessly, adverb
weightlessness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for weightlessness
  • 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.
  • She's studied how humans adapt their motor and cognitive skills in weightlessness and monitored astronauts from the ground.
  • weightlessness and radiation will add to the challenges.
  • Its purpose was to provide a laboratory for scientific experiments, including one on the consequences of prolonged weightlessness.
  • After six years in the making, his vision of using the experience of weightlessness as a meditation finally came to fruition.
  • They'll also experience a split second of weightlessness as they nosedive down the mountainous drop.
  • Millionaires, doctors, and teachers are feeling the fleeting freedom of weightlessness.
British Dictionary definitions for weightlessness


(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)
  1. (of economic activity) based on the supply of information and ideas rather than trade in physical goods: the weightless economy
  2. (of a company) having very few physical assets: weightless dot.coms
Derived Forms
weightlessness, noun
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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Word Origin and History for weightlessness

1884, from weight + -less + -ness.

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for 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
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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