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1. Mathematics A series whose terms are in harmonic progression, especially the series 1 + 1/2 + 1/3 + 1/4 + ....
2. Music A series of tones consisting of a fundamental tone and the consecutive harmonics produced by it.
1. (Mathematics) maths a series whose terms are in harmonic progression, as in 1 + + + …
2. (Music, other) 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
a series in which the reciprocals of the terms form an arithmetic progression.