140/81
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| Ratio | 140/81 |
| Monzo | [2 -4 1 1⟩ |
| Size in cents | 947.3196 |
| Name(s) | septimal semidiminished seventh, septimal inframinor seventh |
| Color name | zy7, zoyo 7th |
| FJS name | m735 |
[sound info] | |
140/81, the septimal semidiminished seventh or septimal inframinor seventh is a 7-limit interseptimal ratio of about 947 cents. It is flat of a minor seventh 16/9 by a septimal quartertone 36/35, flat of a subminor seventh 7/4 by a syntonic comma 81/80, and sharp of a supermajor sixth 12/7 by a sensamagic comma 245/243.
It is also sharp of a major sixth 5/3 by a subminor second 28/27. For this fact it is useful in the Canovian chord and provides the function of a voice leading down to the major sixth. The canou temperament targets this progression and uses it as one of the generators.
It is so perfectly approximated by 19edo (15\19), with an error of 0.05 cents, and hence equally well done by the enneadecal temperament.