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See harmonic motion.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||periodic motion - motion that recurs over and over and the period of time required for each recurrence remains the same|
harmonic motion - a periodic motion in which the displacement is either symmetrical about a point or is the sum of such motions
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