UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈweɪtləs/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈweɪtlɪs/ ,USA pronunciation: respelling(wātlis)

WordReference Random House Learner's Dictionary of American English © 2020
weight•less /ˈweɪtlɪs/USA pronunciation   adj. 
  1. Physicsbeing without apparent weight.
weight•less•ness, n. [uncountable] :periods of weightlessness in the space capsule.

WordReference Random House Unabridged Dictionary of American English © 2020
weight•less  (wātlis),USA pronunciation adj. 
  1. Physicsbeing without apparent weight, as a freely falling body or a body acted upon by a force that neutralizes gravitation.
weightless•ly, adv. 
weightless•ness, n. 
  • weight + -less 1540–50

Collins Concise English Dictionary © HarperCollins Publishers::
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. (of economic activity) based on the supply of information and ideas rather than trade in physical goods: the weightless economy
  3. (of a company) having very few physical assets: weightless dot.coms

ˈweightlessness n
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