Wiktionary
n. (context architecture historical English) The rectangular great hall in a Mycenaean building, usually supported with pillars.
Wikipedia
The megaron (; ), plural megara , was the great hall of the Grecian palace complexes. It was a rectangular hall, fronted by an open, two-columned porch, and a more or less central, open hearth vented though an oculus in the roof above it and surrounded by four columns. It was particularly Aegean, due to the open porch which was usually supported by columns. The entrance was the feature that helps to distinguish the megaron, due to its position at the entrance, which was along the shorter wall so that the depth was larger than the width. There were often many rooms around the central Megaron, such as archive rooms, offices, oil-press rooms, workshops, potteries, shrines, corridors, armories, and storerooms for such goods as wine, oil and wheat.
Usage examples of "megaron".
When my father held court in his megaron, every man who had a desire for the throne (and that was most of them) allowed his eyes to stray to me.
Brutus was now circling the megaron, staring at each of the Dorians in turn, as if assessing their worth.
Antigonus, heretofore kept in the shadows at the back of the megaron, now stepped forward.
The central megaron and living quarters were complete now, their walls rising smooth and creamy in the evening air, their roofs covered with slate.
He stood before his throne on the raised dais of the megaron, one of his legs thrust back as if to retain contact with his golden throne, a piece of somewhat tatty parchment in his hand.
He was still trying to figure that out when the servants showed him into the megaron, the great central hall.