C# 11th chord

C#11 chord for piano presented by keyboard diagrams.
Explanation: The C sharp eleventh is a six-note chord. To avoid dissonance the third (F) is normally omitted. The chord is also often played inverted. The chord is abbreviated as C#11.
Omissions: C#11(no3): C# - G# - B - D# - F#; C#11(no9): C# - F - G# - B - F#.
Theory: The C# eleventh chord is constructed by adding a third to a ninth chord.

C#11

C#11 chord diagram
Notes: C# - F - G# - B - D# - F# / C# - E# - G# - B - D# - F#

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C# chord categories

C# C#m C#7 C#m7 C#maj7 C#mM7 C#6 C#m6 C#6/9 C#5 C#9 C#m9 C#maj9 C#11 C#m11 C#maj11 C#13 C#m13 C#maj11 C#add C#7-5 C#7+5 C#sus C#dim C#dim7 C#m7b5 C#aug C#aug7