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1. Motion due to a continuous change in the magnitude of a given force which reversed its direction with time. </dd>
Vibration is generally interpreted as the cyclical (symmetrical or nonsymmetrical) fluctuations in the rate at which an object accelerates. In longitudinal vibration the direction of motion of the particles is the same as the direction of advance of the vibratory motion; in transverse vibration it is perpendicular to the direction of advance. </dd>
2. The motion of an oscillating body during one complete cycle; two oscillations. </dd>


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