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