Eleventh
In music theory, an eleventh is a compound interval consisting of an octave plus a fourth. A perfect eleventh spans 17 and the augmented eleventh 18 semitones, or 10 steps in a diatonic scale. Since there are only seven degrees in a diatonic scale, the eleventh degree is the same as the subdominant (IV).
Extends: [Chord factors](https://wikipedia.org.ai/Chord factors), Fourths (music), [Compound intervals](https://wikipedia.org.ai/Compound intervals)
Properties
| Property | Expected Type | Description |
|---|---|---|
| [Main Interval Name](https://wikipedia.org.ai/Main Interval Name) | Text | perfect eleventh |
| Inverse | Text | perfect fifth |
| [Other Names](https://wikipedia.org.ai/Other Names) | Text | Compound fourth |
| Abbreviation | Text | P11 |
| Semitones | Text | 17 |
| [Interval Class](https://wikipedia.org.ai/Interval Class) | Text | 1 |
| [Just Interval](https://wikipedia.org.ai/Just Interval) | Text | 8:3 |
| [Cents Equal Temperament](https://wikipedia.org.ai/Cents Equal Temperament) | Text | 1700.0 |
| [Cents Just Intonation](https://wikipedia.org.ai/Cents Just Intonation) | Text | 1698.0 |
| [Main Interval Name](https://wikipedia.org.ai/Main Interval Name) | Text | augmented eleventh |
| Inverse | Text | diminished fifth |
| Abbreviation | Text | A11 |
| Semitones | Text | 18 |
| [Interval Class](https://wikipedia.org.ai/Interval Class) | Text | 6 |
| [Just Interval](https://wikipedia.org.ai/Just Interval) | Text | 45:16 |
| [Cents Equal Temperament](https://wikipedia.org.ai/Cents Equal Temperament) | Text | 1800.0 |
| [Cents Just Intonation](https://wikipedia.org.ai/Cents Just Intonation) | Text | 1790.2 |