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Medical Term:

weightlessness

Pronunciation: wat'les-nes

Definition: The psychophysiologic effect of zero gravity, as experienced by someone falling freely in a vacuum (astronauts in a stable orbit). A temporary state of simulated weightlessness can be achieved during powered flight within the earth's atmosphere by traversing an inverted parabolic curve where gravitational pull and centrifugal force cancel each other out.

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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