noun

• (now historical) A Muslim council of state, specifically that of viziers of the Ottoman Empire that discussed and recommended new laws and law changes to a higher authority (the sultan).
• (now rare) Any council or assembly.
  "Startled at such an unaccountable event, they sat in close divan; and concluding that the case was in all respects unnatural and prodigious, desired that a messenger might be immediately dispatched for some male practitioner in the art of midwifery."
• (dated) An establishment that serves cigars and coffee, and may offer other amenities such as books, newspapers, and chess.
  "These are delightful places, and must be preferred to the cigar shops, if you can afford the extra for coffee, &c. Never sit in a divan, for as these establishments are in imitation of foreign customs, so you should imitate the manners of foreigners, and be as unlike an Englishman as you can; you should therefore lie at full-length on the couches, or "loll" about in some graceful attitude. Should your time be entirely your own, you may remain in the divan the whole day, provided you play at chess; and should you be passionately fond of smoking, you can have smoke at breakfast—smoke at luncheon—smoke at dinner—smoke at tea—smoke at supper"