| weightlessness | Condition in which no acceleration, whether due to gravity or any other force, can be detected by an observer within a system. It also means the absence of weight or the absence of the force of gravity acting on a body. Microgravity, gravitational force between 0 and 10 -6 g, is included here. (12 Dec 1998) |
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| weightlessness countermeasures | Techniques and routines designed to prevent or reverse unwanted effects of weightlessness experienced during actual and simulated space flight, including physiologic changes related to removal of gravitational loading. Specific measures include creation of artificial gravity, exercise, low-level lower body negative pressure, and use of anti-deconditioning devices. (12 Dec 1998) |
| weightlessness simulation | Condition under normal earth gravity where the force of gravity itself is not actually altered but its influence or effect may be modified and studied. (12 Dec 1998) |