Definition of rotunda noun from the Oxford Advanced Learner's Dictionary

 

rotunda

 noun
noun
BrE BrE//rəʊˈtʌndə//
 
; NAmE NAmE//roʊˈtʌndə//
 
Parts of a house
 
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a round building or hall, especially one with a curved roof (= a dome) See related entries: Parts of a house Word Origin early 17th cent.: alteration of Italian rotonda (camera) ‘round (chamber)’, feminine of rotondo ‘round’, from Latin rotundus, from rotare ‘rotate’.
See the Oxford Advanced American Dictionary entry: rotunda