The A diminished chord (abbreviated "Adim chord") is a triad consisting of the notes A, C, and E. The chord is formed by lowering the fifth of a A minor chord a half step.

Name
A diminished chord
Synonym
A diminished triad
Notes
A C E
Intervals
1 3 5
Chord symbol
Ao
Alternative symbols
Adim Am(b5) Amb5
Type
triad (three-note chord)

Adim chord on piano

Adim chord on guitar

Adim chord on ukulele

Adim chord on the staff