Processional

Webster's Dictionary

(1):

(n.) A service book relating to ecclesiastical processions.

(2):

(a.) Of or pertaining to a procession; consisting in a procession.

(3):

(n.) A hymn, or other selection, sung during a church procession; as, the processional was the 202d hymn.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

(Lat. processionale), the servicebook which contains the prayers, hymns, and general ceremonial of the different processions. Many ancient books of this class have been preserved. The processional approved for common use is that of Rome, of which many editions have been published.