term used for the church-modes in Mediaeval music that lie a quarter below the authentic modes; a melody is called plagal if the tonic lies a quarter above its lowest note (not counting a leading tone); ➺ Authentic

Plagal (Escala ~) - Spanish (Castilian)

Plagal (scale) - English

Plagal (i.e. Plagale Tonleiter) - German

Plagale (Échelle ~) - French