We found 3 dictionaries that define the word harmonic motions:

General (3 matching dictionaries)

1. harmonic motions: Merriam-Webster
2. harmonic motions: Collins English Dictionary
3. harmonic motions: Vocabulary.com

(Note: See harmonic_motion as well.)

Definitions from Wiktionary (harmonic motion) ▸ noun:  The motion of a harmonic oscillator ▸ Also see harmonic_motion Phrases: simple harmonic motions, more... ▸ Words similar to harmonic motions ▸ Usage examples for harmonic motions ▸ Idioms related to harmonic motions ▸ Wikipedia articles (New!) ▸ Words that often appear near harmonic motions ▸ Rhymes of harmonic motions ▸ Invented words related to harmonic motions