/ Thesaurus / S Synonyms of simple harmonic motion Find synonyms for: Noun1. simple harmonic motion, harmonic motionusage: periodic motion in which the restoring force is proportional to the displacementWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language