a Muslim council chamber or law court
a collection of devotional poetry intended to be sung, which covers religious and secular subjects and is performed on festive occasions
Muslim administrative offices of the state or the sovereign's council of state
It is a government office where the governor (ruler) sets receptions for the population. It may also means the room where the ruler meets his council to discuss the affairs of the state. In poetry, it is used to mean a work (book) of collection of poems.
Diwan (Persian دیوان), also transliterated as Deewan or Divan, is a Persian word used also in to Arabic (Arabic: الدیوان) and Turkish, and was borrowed also at an earlier date into Armenian.DÄ«vÄn http://www.iranica.com/articlenavigation/index.html| Encyclopaedia Iranica, VOLUME 7 FASCICLE 4]
The originally Persian title of diwan (also quite commonly known as Dewan; also spelled -van) has at various points in the Islamic history, designated various differing though similar functions.