What is "ordinalia"

The Ordinalia are three medieval mystery plays dating to the late fourteenth century, written primarily in Middle Cornish, with stage directions in Latin. The three plays are Origo Mundi (The Origin of the World, aka Ordinale de Origine Mundi, 2,846 lines), Passio Christi (The Passion of Christ, aka Passio Domini Nostri Jhesu Christi, 3,242 lines) and Resurrexio Domini (The Resurrection of Our Lord aka Ordinale de Ressurexione Domini, 2,646 lines). The metres of these plays are various arrangements of seven- and four-syllabled lines. Ordinalia means "prompt" or "service book".