Eleventh

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Perfect eleventh on C. About this sound Play 
perfect eleventh
Inverse perfect fifth
Name
Other names Compound fourth
Abbreviation P11
Size
Semitones 17
Cents
Equal temperament 1700.0
Augmented eleventh on C. About this sound Play 
augmented eleventh
Inverse diminished fifth
Name
Abbreviation A11
Size
Semitones 18
Cents
Equal temperament 1800.0

In music or music theory an eleventh About this sound play  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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