processional

1. (Roman Catholicism) A service book relating to ecclesiastical processions.Examples: "[47] Item that the Churchwardens of euery paryshe shall delyuer vnto our visitours the inuentories of vestmentes, copes, and other ornamentes, plate, bookes, and specyallye of Grayles, Couchers, Legendes, Processionalles, Hymnalles, Manuelles, Portuesses, and suche lyke apperteynyng to theyr Church."; "c. 1640s, John Gregory, “Episcopus Puerorum In Die Innocentium: Or, A Discovery of an Ancient Custom in the Church of Sarum, making an Anniversary Bishop among the Choristers” in The Works of the Reverend and Learned Mr. John Gregory, London: R. Royston and T. Williams, 1671, p. 114, By the Use of Sarum (for ’tis almost the only place where I can hear any thing of this; that of York in their Processional seems to take no notice of it) upon the Eve to Innocents Day the Chorister-Bishop was to go in solemn Procession with his fellows […]"