noun
: an ascending diatonic musical scale of eight notes or tones comprising an octave and consisting of a pentachord and a tetrachord of which the highest tone of one is the lowest tone of the other — called also Gregorian mode, medieval mode ; see dorian mode , hypodorian mode , hypomixolydian mode , hypophrygian mode , lydian mode , mixolydian mode , phrygian mode ; mode illustration