Etymology
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rotunda (n.)

"round building," especially one with a dome, 1680s, from Italian rotonda, typically in reference to the Pantheon, the most celebrated building of this kind, from noun use of Latin rotunda, fem. of rotundus "round" (see rotund). Meaning "circular hall or room within a building" is from 1780.

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Definitions of rotunda

rotunda (n.)
a building having a circular plan and a dome;
rotunda (n.)
a large circular room;
From wordnet.princeton.edu