Text: Counterpoint of four parts, so constructed that all the parts may be transposed among themselves without transgressing the laws of progression. A perfect piece of this kind of counterpoint will be capable of twenty-four different dispositions of the parts. It is only feasible at the interval of the octave.

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Source: A Dictionary of Musical Terms , Stainer, John; Barrett, W.A., Novello, Ewer and Co., London, pre-1900 ,