Definition of rotunda in English:

rotunda

Syllabification: ro·tun·da
Pronunciation: /rōˈtəndə
 
/

noun

A round building or room, especially one with a dome.
More example sentences
  • Similar to the curving rotundas of many capitol buildings, but, crucially, allowing in more daylight, it is monumental without losing its human scale.
  • Visitors during the summer of 2002 may expect to see a new black-and-white marble floor in the rotunda beneath the dome.
  • If he treats the rotunda like the tower, some solar shading may be in the works.

Origin

early 17th century: alteration of Italian rotonda (camera) 'round (chamber)', feminine of rotondo 'round' (see rotund).

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Pronunciation: grəˈmɛːrɪən
noun
a person who studies and writes about grammar