C major 11th chord

Cmaj11 chord for piano with keyboard diagram.
Explanation: The C major eleventh is a six-note chord. For practical reasons the chord is normally played with omitted notes and/or inverted. It is often abbreviated as Cmaj11 or Cmaj9(#11). In the latter case, the chord is played with a raised eleventh to avoid dissonance with the 3rd.
Omissions: Cmaj11(no5): C - E - B - D - F.
Theory: The C major eleventh chord is constructed by extending the major ninth chord with a major eleventh note.

Cmaj11

Cmaj11 piano chord diagram
Notes: C - E - G - B - D - A

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C chord categories

C Cm C7 Cm7 Cmaj7 CmM7 C6 Cm6 C6/9 C5 C9 Cm9 Cmaj9 C11 Cm11 Cmaj11 C13 Cm13 Cmaj13 Cadd C7-5 C7+5 Csus Cdim Cdim7 Cm7b5 Caug Caug7