diwan Syllabification: (di·wan)Pronunciation: /diˈwän/ (also dewan)Definition of diwan noun 1(in Islamic societies) a central finance department, chief administrative office, or regional governing body. 2a chief treasury official, finance minister, or prime minister in some Indian states. Origin:Urdu, from Persian dīwān 'fiscal register'; compare with divandiwan in other Oxford dictionaries Definition of diwan in the British & World English dictionary