Ab11 chord
The A-flat dominant eleventh chord (abbreviated "Ab11 chord") is a six-note chord consisting of the notes A♭, C, E♭, G♭, B♭, and D♭. The chord is formed by adding an eleventh to a A-flat dominant ninth chord.
In practice, the third (C) and fifth (E♭) are often omitted from the Ab11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.
Name
A-flat dominant eleventh chord
Notes
A♭ C E♭ G♭ B♭ D♭
Intervals
1 3 5 ♭7 9 11
Chord symbol
A♭11
Type
Hexad (six-note chord)