Divider, Teiler. A note that divides a large interval into two roughly equal portions, usually in a bass progression. The dominant (or subdominant) can act as a divider of the tonic and its octave, and usually forms the root of a contrapuntal chord. The third can act as a divider of the fifth. The term divider is especially useful in distinguishing functional harmonies (Stufen) from contrapuntal harmonies. A leaping passing-tone (springender Durchgang) fills a similar function in the upper voice.
The example, from Variation 14, shows
III as a divider between I and V in the first half of the variation.