Etymology
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overtone (n.)

1867, in music, "a harmonic, an upper partial tone," from over- + tone (n.); a loan-translation of German Oberton, which was first used by German physicist Hermann Ludwig Ferdinand von Helmholtz (1821-1894) as a contraction of Overpartialton "upper partial tone." Figurative sense of "subtle implication" is from 1890, in William James.

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Definitions of overtone

overtone (n.)
(usually plural) an ulterior implicit meaning or quality;
overtones of despair
overtone (n.)
a harmonic with a frequency that is a multiple of the fundamental frequency;
Synonyms: partial / partial tone
From wordnet.princeton.edu