This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A circular building, especially one with a dome.

n. A large area with a high ceiling, as in a hotel lobby.

n. A large round room.

n. a round building, usually small, often with a dome

n. A round building; especially, one that is round both on the outside and inside, like the Pantheon at Rome. Less properly, but very commonly, used for a large round room.

n. A round building, especially one with a dome; any building that is round both outside and inside. The most celebrated edifice of this kind is the Pantheon at Rome. See cuts under octastyle and pantheon.

n. A circular hall in a large building, generally surmounted by a dome: as, the rotunda of the Capitol in Washington.

n. a large circular room

n. a building having a circular plan and a dome

"First thing you see in the rotunda is the statue of Chief Washakie."

room    building    edifice   

atrium    portico    basilica    foyer    mausoleum    ballroom    amphitheater    piazza    auditorium    plaza