Fourth

(Ger. Quar’te; Fr. quarte; It. quar’ ta.) 1. The fourth degree in the diatonic scale; the subdominant.—2. An interval embracing 4 degrees (see /ntervat), The typical or standard fourth is the perfect (or major) fourth, equal to the interval between the key-note and the 4th tone of its vibrational the diatonic FE E— ratio being scale, as c.f: CLP Bide. Diminished (imperfect, defective, minor, ot false) fourth, an interval narrower by achromatic semitone than a perfect fourth...Augmented (pluperfect, superfluous, or extreme) fourth,one ‘wider by a chromatic semitone than a perfect fourth.