Campbell, Lawrence Dundas (ed), Asiatic Annual Register for 1802, or A View of the History of Hindustan and of the Politics, Commerce and Literature of Asia, London, J. Debrett, 1803, footnote pp.97-100, Miscellaneous Tracts [1]
Definition per James Mill (1826): "Dewan, Duan: place of assembly. Native minister of the revenue department; and chief justice, in civil causes, within his jurisdiction; receiver-general of a province. The term is also used, to designate the principal revenue servant under a European collector, and even of a Zemindar. By this title, the East India Company are receivers-general of the revenues of Bengal, under a grant from the Great Mogul"..."Dewanny, Duannee: the office, or jurisdiction of a Dewan" (Mill, James, The History of British India, Vol. 1 (of 6), 3rd Edition, London, 1826, Glossary [2])