Meaning of Diesis in Music
In classical music from Western culture, a **diesis** refers to a small interval that is smaller than a whole tone or a semitone. The term has different meanings in ancient Greek theory and modern theory. In ancient Greek theory, a diesis is any interval smaller than a whole tone, especially a semitone in the Pythagorean scale. In modern theory, a diesis refers to the discrepancy of pitch in just intonation between an octave and either a succession of four ascending minor thirds (great diesis) or a succession of three ascending major thirds (minor diesis).
The undecimal diesis, for example, is equal to 45:44 or about 38.91 cents. It is closely approximated by the 38.71 cent interval in 31 equal temperament.
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Italian term for the sharp symbol.
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