Definition of weightless adjective from the Oxford Advanced American Dictionary

 

weightless

 adjective
adjective
NAmE//ˈweɪtləs//
 
 
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having no weight or appearing to have no weight, for example because there is no gravity Astronauts work in weightless conditions.
weightlessness
 
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noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: weightless