2 definitions found From WordNet (r) 2.0 [wn]: rotunda noun 1: a building having a circular plan and a dome 2: a large circular room From The Collaborative International Dictionary of English v.0.44 [gcide]: Rotunda \Ro*tun"da\, noun [Cf. It. rotonda, F. rotonde; both fr. L. rotundus round. See {Rotund}, adjective] (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.

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