Webster's Dictionary 
(1): ( n.) An inclosure; a place of separation.
(2): ( n.) A harem; a place for keeping wives or concubines; sometimes, loosely, a place of licentious pleasure; a house of debauchery.
(3): ( n.) The palace of the Grand Seignior, or Turkish sultan, at Constantinople, inhabited by the sultan himself, and all the officers and dependents of his court. In it are also kept the females of the harem.
The Nuttall Encyclopedia 
In its restricted sense applied in the East to a harem or women's quarters in a royal household; the former residence of the sultan of Turkey, occupies a beautiful site on the E. side of Constantinople, on a projecting piece of land between the Golden Horn and the Sea of Marmora, enclosing within its 3 m. of wall government buildings, mosques, gardens, &c., chief of which is the harem, which occupies an inner enclosure.