'Rotunda' definitions:
Definition of 'rotunda'
From: WordNet
noun
A building having a circular plan and a dome
noun
A large circular room
Definition of 'Rotunda'
From: GCIDE
- Rotunda \Ro*tun"da\, n. [Cf. It. rotonda, F. rotonde; both fr. L. rotundus round. See Rotund, a.] (Arch.) 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; as, the rotunda of the Capitol at Washington. [1913 Webster]