rotunda

A circular building, especially one with a dome.

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

A large round room.

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.

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

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.

a round building, usually small, often with a dome

a large circular room

a building having a circular plan and a dome