Eleventh

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Perfect eleventh on C. Play 
perfect eleventh
Inverseperfect fifth
Name
Other namesCompound fourth
AbbreviationP11
Size
Semitones17
Cents
Equal temperament1700.0
Augmented eleventh on C. Play 
augmented eleventh
Inversediminished fifth
Name
AbbreviationA11
Size
Semitones18
Cents
Equal temperament1800.0

In music or music theory, an eleventh 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 major third.

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

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