The A-flat dominant seventh chord (abbreviated "Ab7 chord") is a four-note chord consisting of the notes A♭, C, E♭, and G♭. The chord is formed by adding a minor seventh to a A-flat major chord.
A-flat dominant seventh chord
A-flat major-minor seventh chord
A♭ C E♭ G♭
1 3 5 ♭7
Tetrad (four-note chord)