Examples from the Web for plagal
A plagal cadence is one in which the tonic chord is preceded by the sub-dominant chord (IV—I).Music Notation and Terminology|Karl W. Gehrkens
Thus the melody itself was said to be either authentic or plagal, according to whether it had one or two tonics.
These enharmonic passages recur to satiety, and the abuse of the plagal cadence deprives it of its religious solemnity.The Works of Honor de Balzac|Honor de Balzac
The theme of Schumann's “Etudes symphoniques” is authentic, and the first variation is plagal.
These modes are divided into two classes—the “authentic” and “plagal.”Music in the History of the Western Church|Edward Dickinson