In a way that relates to harmony; in a manner that is musically or mathematically harmonic.
From harmonic (Greek harmonikos + -ic) + -ally (adverb suffix). This formation is heavily used in modern scientific and musical contexts to describe behavior following harmonic principles.
When physicists say oscillations 'harmonically relate,' they mean they vibrate at frequencies that are whole-number multiples of each other—the same mathematical beauty that makes musical intervals pleasing to human ears.
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