Definition of weightlessness noun from the Oxford Advanced Learner's Dictionary

 

weightlessness

 noun
noun
BrE BrE//ˈweɪtləsnəs//
 
; NAmE NAmE//ˈweɪtləsnəs//
 
[uncountable]
 
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the fact of having or appearing to have no weight, for example because there is no gravity an experience of weightlessness