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.
British Dictionary definitions for harmonic motion
harmonic motion
noun
a periodic motion in which the displacement is symmetrical about a point or a periodic motion that is composed of such motionsSee also simple 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
