a round building, especially one with a dome.
a large and high circular hall or room in a building, especially one surmounted by a dome.

1680–90; alteration of Italian rotonda, noun use of feminine of rotondo < Latin rotundus rotund Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rotunda (rəʊˈtʌndə)
a building or room having a circular plan, esp one that has a dome
[C17: from Italian rotonda, from Latin rotundus round, from rota a wheel]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"round building," 1687, from It. rotonda, especially the Pantheon, from L. rotunda, fem. of rotundus "round" (see rotund). Meaning "circular hall or room within a building" is from 1780.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Note the stenciling and the four murals on the interior's rotunda.
Individual paintings of each word are displayed around the library's rotunda so
  that viewers encounter them randomly.
In the rotunda, which is the lobby where you walk in, there is this stunning
  chandelier-a major focal point of the theater.
There were popular stars in the past equipped with their own rotunda.
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