| Definition: | integral numbers given to the successive overtones of a given mode of vibration, in order of increasing frequency commencing with the fundamental as unity frequency Note 1 to entry: For shear and extension modes, the overtone order is the quotient of the frequency of the overtone by the fundamental frequency rounded to the nearest whole number. Note 2 to entry: This entry was numbered 561-02-04 in IEC 60050-561:1991.
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