Diminished third
| Inverse | augmented sixth |
|---|---|
| Name | |
| Other names | - |
| Abbreviation | d3 |
| Size | |
| Semitones | 2 |
| Interval class | 2 |
| Just interval | 144:125, 256:225 |
| Cents | |
| Equal temperament | 200 |
| 24 equal temperament | 200 |
| Just intonation | 245, 223, 231 |
In classical music from Western culture, a diminished third (
Play ) is the musical interval produced by narrowing a minor third by a chromatic semitone. For instance, the interval from A to C is a minor third, three semitones wide, and both the intervals from A♯ to C, and from A to C♭ are diminished thirds, two semitones wide. Being diminished, it is considered a dissonant interval.
In equal temperament a diminished third is enharmonic with the major second, both having a value of 200 cents. However, in meantone tunings with fifths flatter than the 700 cents of equal temperament, the diminished third is wider than the major second. In 19 equal temperament it is in fact enharmonically equivalent to an augmented second, both having a value of 252.6 cents. In 31 equal temperament it has a more typical value of 232.3 cents. In a twelve-note keyboard tuned in a meantone tuning from E♭ to G♯, the dimininished third appears between C♯ and E♭, and again between G♯ and B♭.
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