Definitions for "Weightlessness"
the condition that exist when an object is in free fall (the only force on the object is the gravity)
The experience of being in free fall. If you are in a satellite, elevator, or other free-falling object, then you have a weight of zero Newtons relative to that object.
(or "zero gravity") the condition when no force (such as weight) is sensed. Occurs in orbit or free fall, when gravity already produces its full acceleration and can produce no further effect.
the property of being comparatively small in weight; "the lightness of balsa wood"