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harmonic (adj.)

1560s, "relating to music," from Latin harmonicus, from Greek harmonikos "harmonic, musical, skilled in music," from harmonia (see harmony). From 1660s as "tuneful, harmonious; relating to harmony" (earlier as armonical "tuneful, harmonious," c. 1500). The noun, short for harmionic tone, is recorded from 1777. Related: Harmonically.

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Definitions of harmonic from WordNet
1
harmonic (adj.)
of or relating to harmony as distinct from melody and rhythm; "subtleties of harmonic change and tonality"- Ralph Hill;
harmonic (adj.)
of or relating to harmonics;
harmonic (adj.)
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
harmonic (adj.)
relating to vibrations that occur as a result of vibrations in a nearby body;
Synonyms: sympathetic
harmonic (adj.)
involving or characterized by harmony;
Synonyms: consonant / harmonical / harmonized / harmonised
2
harmonic (n.)
a tone that is a component of a complex sound;
harmonic (n.)
any of a series of musical tones whose frequencies are integral multiples of the frequency of a fundamental;
From wordnet.princeton.edu