In music theory, a nondominant seventh chord is both a diatonic chord and a seventh chord, but it does not possess dominant function, and thus it is not a dominant seventh chord. Since the V and viio chords are the dominant function chords, the "major minor seventh" V7 and "half-diminished seventh" viiø7 are the dominant seventh chords. Since the nondominant function chords are I, i, ii, iio, iii, III, IV, iv, vi, and VI, the nondominant seventh chord qualities include the augmented major seventh chord, major seventh chord, minor major seventh chord, minor seventh chord, and major minor seventh chords that do not possess dominant function, such as, in melodic minor, IV7m.