a series whose terms are in harmonic progression, as in 1 + 1⁄2 + 1⁄3 + …
2. acoustics
the series of tones with frequencies strictly related to one another and to the fundamental tone, as obtained by touching lightly the node points of a string while playing it. Its most important application is in the playing of brass instruments
harmonic series in American English
noun
the series of harmonic tones making up a composite tone