Ground

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Ground

</dt>
1. The earth's surface, especially the earth's land surface. Used in combination to form adjectives, as in ground-to-air, ground-to-ground , and air-to-ground. See surface. </dd>
2. The domain of nonflight operations that normally take place on the earth's surface or in a vehicle or on a platform that rests upon the surface, as in ground support. </dd>
3. = electrical ground. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use