Consuetudinary

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Consuetudinary (Med. Lat. consuetudinarius, from consuetudo, custom), customary, a term used especially of law based on custom as opposed to statutory or written law. (See also: Oral law, Custom)

As a noun consuetudinary (Lat. consuetudinarius) is the name given to a ritual book containing the forms and ceremonies used in. the services of a particular monastery, cathedral or religious order.