Triad qualities refer to the different qualities or characteristics that triads can have based on their intervals - major (M), minor (m), diminished (d), and augmented (A). These qualities determine the overall sound and mood of a triad.
Related terms
Root: The lowest note of a triad, which determines the name and quality of the triad.
Inversion: A rearrangement of the notes in a triad so that a different note becomes the lowest (or bass) note.
Seventh Chords: Chords that consist of four notes, including a triad with an added seventh interval.