Definition of “weightless” - English Dictionary

“weightless” in British English

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uk /ˈweɪt.ləs/ us /ˈweɪt.ləs/
adverb uk /ˈweɪt.lə us /ˈweɪt.lə
noun [ U ] uk /ˈweɪt.ləs.nəs/ us /ˈweɪt.ləs.nəs/

(Definition of “weightless” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“weightless” in American English

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us /ˈweɪt·ləs/

weightless adjective (NOT HEAVY)

being in a state in which gravity (= the force by which the earth attracts objects) does not cause movement of objects:

The astronauts are weightless in space.
noun [ U ] us /ˈweɪt·lə·snəs/

Then the rocket motor will shut down and passengers will experience the silence of space and the magic of weightlessness.

(Definition of “weightless” from the Cambridge Academic Content Dictionary © Cambridge University Press)