The word, recorded in English since 1586, meaning "Oriental council of a state," from Turkish divan, from Arabic diwan, is a Middle-Persian loan-word in Arabic and was borrowed also at an earlier date into Armenian dīvān, "bundle of written sheets, small book, collection of poems" (as in the Divan-i Hafiz), related to debir, "writer." The sense of the word evolved from "book of accounts" to "office of accounts," "custom house," and "council chamber," then to "long, cushioned seat," such as are found along the walls in Middle-Eastern council chambers. The latter is the sense that entered European languages as divan (furniture). The modern French, Spanish, and Italian words douane, aduana, and dogana, respectively (meaning "customs"), also come from diwan.
The word first appears in the ninth-century descriptions of the caliphate of Omar I (A.D. 634-644). Great wealth, gained from the Muslim conquests, was pouring into Medina, and a system of business management and administration became necessary. This was copied from the Persians (whose Sassanid empire was being conquered and islamised under Umar) and given the Persian name divan. Later, as the state became more complicated, the term was extended over all the government bureaus.
The divan of the Sublime Porte was for many years the council of the Ottoman Empire. It consisted of the Grand Vizier, who presided when the Sultan was absent, and other viziers, kazaskers, nisanci, defterdar, and occasionally the Janissary Ağa.
Ministerial departments 
- Diwan al-Alaf: ministry of War.
- Diwan al-Bahr: 'ministry of the Sea', i.e. (overseas=) Foreign ministry.
- Diwan al-Shikayat (or - Chikayat): ministry of Complaints.
In the Abbasid Caliphate, other portfolios were kept:
- diwan al-azimma: budget department
"Divan" refers to two types of palatial buildings in Indian courts. They tend to occur in pairs in the Mughal imperial capitals; the most famous ones are in Agra Fort, but there are others in Red Fort, Delhi and Fatehpur Sikri and certain other princely capitals such as Amber and also in Lahore Fort Pakistan.
(Persian ديوان عام), also Divan-i-Aam. The court's Hall of Public Audience, where the ruler held mass audience. He would sit on his throne facing petitioners. His minister would assemble the petitions and refer them to the Dīwān-e-Khās for private audience.It was made by Shah Jahaan.
(Persian: ديوان خاص). A court's Hall of Private Audience, smaller than the Dīwān-e-Ām. Here envoys and other honoured guests were granted a personal audience with the ruler. At Agra, the Dīwān-i-Khās is a small marble structure near the Dīwān-e-Ām. It is inside a red fort. It was the most ornamental building built by Shahjhan. It was decorated by gems and gold silver linings. A channel built by marble in which water flows justifies its exceptional beauty. On one of its walls this verse in Persian language is written:
If there is paradise anywhere on earth it is here, it is here, it is here
Other uses 
West-Eastern Divan Orchestra 
The West-Eastern Divan Orchestra is a youth orchestra consisting of musicians from countries in the Middle East, bringing together young musicians from Egypt, Iran, Israel, Jordan, Lebanon, Palestine, and Syria. It was founded in 1999 by the Argentine-Israeli conductor Daniel Barenboim and the late Palestinian-American academic and author Edward Said.
Sources and references 
- François de Blois, "Divan", Encyclopaedia Iranica; accessed February 10, 2007