Velocity

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Velocity V )</strong> </dt>
1. = speed. See note. </dd>
2. A vector quantity equal to speed in a given direction. </dd>
In sense 1, velocity is often used synonymously with speed, as in the velocity of the airplane, but in such contexts speed is properly the preferred term; except in the compound airspeed, velocity is preferred to speed in reference to motion of air or other fluid. </dd>

References

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