(7♭5) seventh flat five chord

Definition: The term seventh flat five is used primarily in jazz, and refers to a seventh chord that contains a diminished fifth interval:

• C Dominant 7th Flat Five (C7^♭5)
  
  A dominant 7th with a flattened fifth:
  
    ♦ Root: C
    ♦ Major 3rd: E
    ♦ ° 5th: G♭*
    ♦ Minor 7th: B♭



• C Minor 7th Flat Five (Cm7^♭5)**
  
  A minor 7th with a ♭5:
  
    ♦ Root: C
    ♦ Minor 3rd: E♭
    ♦ ° 5th: G♭
    ♦ Minor 7th: B♭

* The symbol ° means diminished, or “flattened by a half step.”

** A min7♭5 is also called a half-diminished chord.


See sharp five chord.