Usual or normal for a particular person, place, or group; done according to custom.
From Medieval Latin 'consuetudinarius' via Old French forms, relating to 'consuetudo' meaning 'custom or habit'. It originally described things based on long-use practices, especially in law.
When something is 'customary', it’s not written in stone, but everyone acts like it is. It shows how powerful repeated behavior can be—even without any official rulebook.
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