1911 Encyclopædia Britannica/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. As a noun "consuetudinary" (Lat. consuetudinarius, sc. liber) 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.