Glossary of Space Exploration Terminology

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W
Walking orbit
An orbit in which gravitational influences are used to induce a precession in a satellite's orbital plane.
Wavelength
The distance from crest to crest, or trough to trough, of an electromagnetic or other wave. Wavelengths are related to frequency: The longer the wavelength, the lower the frequency.
Weight
The force acting on a body in a gravitational field, equal to the product of its mass and the acceleration of the body produced by the field.
Weightlessness
A state experienced in a ballistic trajectory (i.e. in orbit or free fall) when, because the gravitational attraction is opposed by equal and opposite inertial forces, a body experiences no mechanical stress.

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Rocketry & Space Technology

Glossary courtesy of Robert Braeunig's
Rocketry & Space Technology website.