The A diminished seventh chord (abbreviated "Adim7 chord") is a four-note chord consisting of the notes A, C, E, and G. The chord is formed by adding a diminished seventh to a A diminished chord.

Name
A diminished seventh chord
Synonym
A fully diminished chord
Notes
A C E G
Intervals
1 3 5 7
Chord symbol
Ao7
Alternative symbols
Adim7 Adim Ao
Type
Tetrad (four-note chord)

Adim7 chord on piano

Adim7 chord on guitar

Adim7 chord on ukulele

Adim7 chord on the staff