One of the mysteries of the English language finally explained.
In the Islamic regions of South-East Asia: custom, accepted practice.
Late 18th century; earliest use found in William Marsden (1754–1836), orientalist and numismatist. From Malay adat custom, convention, rule, law, customary law (Indonesian adat) from Persian ʿādat habit, custom from Arabic ʿādat-, ʿāda habit, custom, usage, practice.
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