# Eleventh

Inverse | perfect fifth |
---|---|

Name | |

Other names | Compound fourth |

Abbreviation | P11 |

Size | |

Semitones | 17 |

Cents | |

Equal temperament | 1700.0 |

Inverse | diminished fifth |
---|---|

Name | |

Abbreviation | A11 |

Size | |

Semitones | 18 |

Cents | |

Equal temperament | 1800.0 |

In music or music theory an **eleventh** play (help·info) 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 be also described as a compound fourth, spanning an octave plus a fourth.

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 third.

A **perfect eleventh** is an eleventh which spans exactly 17 semitones. It can be also described as a compound perfect fourth, spanning an octave plus a perfect fourth.

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