"harmonic" in the noun sense
a tone that is a component of a complex sound
any of a series of musical tones whose frequencies are integral multiples of the frequency of a fundamental
"harmonic" in the adjective sense
of or relating to harmony as distinct from melody and rhythm
"subtleties of harmonic change and tonality"- Ralph Hill
of or relating to harmonics
of or relating to the branch of acoustics that studies the composition of musical sounds
"the sound of the resonating cavity cannot be the only determinant of the harmonic response"
4. harmonic, sympathetic
relating to vibrations that occur as a result of vibrations in a nearby body
5. consonant, harmonic, harmonical, harmonized, harmonised
involving or characterized by harmony
Source: WordNet® (An amazing lexical database of English)
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