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