harmonic
US /hɑːrˈmɑː.nɪk/
UK /hɑːrˈmɑː.nɪk/

1.
relating to harmony as opposed to melody or rhythm
:
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The choir produced a rich harmonic sound.
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The composer focused on the harmonic structure of the piece.
2.
of or relating to a series of musical notes whose frequencies are integral multiples of a fundamental frequency
:
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The overtone series consists of harmonic frequencies.
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Each string instrument produces its own unique set of harmonic overtones.
3.
forming a pleasing or consistent whole
:
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The colors in the painting are very harmonic.
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They achieved a harmonic balance between work and leisure.
1.
a harmonic overtone
:
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The musician played a note and then isolated its first harmonic.
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Engineers analyzed the different harmonics present in the sound wave.