Inverse | perfect fifth |
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Name | |

Other names | Compound fourth |

Abbreviation | P11 |

Size | |

Semitones | 17 |

Cents | |

12-Tone equal temperament | 1700.0 |

Inverse | diminished fifth |
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Name | |

Abbreviation | A11 |

Size | |

Semitones | 18 |

Cents | |

12-Tone equal temperament | 1800.0 |

In music or music theory, an **eleventh** is the note eleven scale degrees from the root of a chord and also the interval between the root and the eleventh. The interval can also be described as a compound fourth, spanning an octave plus a fourth.^{[1]}

Since there are only seven degrees in a diatonic scale the eleventh degree is the same as the subdominant.

The eleventh is considered highly dissonant with the major third.

A **perfect eleventh** is an eleventh which spans exactly 17 semitones.

**^**Benward, Bruce; Saker, Marilyn (2003).*Music: In Theory and Practice, Vol. I*. McGraw-Hill Education. ISBN 978-0-07-294262-0.

Twelve- semitone (post-Bach Western) |
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Other tuning systems |
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Other intervals |
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