Apadana hall and the adjacent structures in the complex are believed to have been designed to host large number of people.
From the en.wikipedia.org
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The great hall in ancient Persian palaces
An apadana (u00CFu00F3u2518u00A5u00CFu00BAu00CFu00BBu00CFu00BAu2518u00E5u00CFu00BA) is a large hypostyle hall, the best known examples being the great audience hall and portico at Persepolis and the palace of Susa. ...
The Apadu2500u00FCna is a collection of biographical stories found in the Khuddaka Nikaya of the Pu2500u00FCli Canon, the scriptures of Theravada Buddhism. It is thought by most scholars to be a late addition to the canon, composed during the 1st and 2nd century BCE. ...
(lit. 'take off'): "(that which is) firm when departure (takes place)." This is the equivalent of the ablative case, which signifies a stationary object from which movement proceeds.