harmonic-motion

harmonic motion

noun Physics.
periodic motion consisting of one or more vibratory motions that are symmetric about a region of equilibrium, as the motion of a vibrating string of a musical instrument.

Origin:
1865–70

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World English Dictionary
harmonic motion
 
n
See also simple harmonic motion a periodic motion in which the displacement is symmetrical about a point or a periodic motion that is composed of such motions

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
harmonic motion  
A periodic vibration, as of a violin string, in which the motions are symmetrical about a region of equilibrium. Such a vibration may have only one frequency and amplitude or may be a combination of two or more components called harmonics. Also called periodic motion.
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