Based on or relating to customs and traditional practices that have become accepted over long periods of time.
From 'consuetude' + '-ary' (relating to). Similar to 'consuetudinal,' this '-ary' adjective form emphasizes the connection between the word and the system of custom-based practices.
In medieval England, 'consuetudinary law' referred to all the unwritten rules that everyone knew and followed—basically, the entire legal system worked on what people had always done, making memory and witness testimony incredibly important in court.
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