The A half-diminished seventh chord (abbreviated "Am7(b5) chord") is a four-note chord consisting of the notes A, C, E, and G. The chord is formed by lowering the fifth of a A minor seventh chord a half step.

Name
A half-diminished seventh chord
Synonyms
A half-diminished chord A minor seventh flat five chord
Notes
A C E G
Intervals
1 3 5 7
Chord symbol
Am7(b5)
Alternative symbols
Aø Aø7 Am7b5 A7(b5) Ami7(b5) Amin7(b5)
Type
Tetrad (four-note chord)

Am7(b5) chord on piano

Am7(b5) chord on guitar

Am7(b5) chord on ukulele

Am7(b5) chord on the staff