Iii (III) Chord

Definition

The iii (III) chord is a major chord built on the third scale degree of a major key or the minor chord built on the raised third scale degree of a minor key.

Related terms

Mediant: The mediant is another name for the iii (III) chord. It refers to its position as the third scale degree in relation to the tonic.

Parallel Minor/Major: The iii (III) chord shares tonalities with its parallel minor or major key, making it harmonically related to those keys.

Chromaticism: The iii (III) chord can introduce chromaticism into a progression by altering one note from the diatonic scale, adding color and tension.