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noun

rotunda

/roʊˈtʌndə/  ·  say it: roh·TUN·duh

a round building or hall, usually domed

In Architecture & Design

In more detail

1. (noun) a round building with a dome-shaped roof

2. (noun) a large circular room or hall, especially inside a building

Examples

How to use rotunda

Rotunda refers to a distinctive architectural feature—either an entire round building or a prominent circular interior space, typically in civic, religious, or monumental buildings. It often implies classical or neoclassical design with a dome. The term is primarily used in formal architectural or historical contexts.

Register: formal

Common phrases

Synonyms

circular building · dome · round hall · circular chamber · cupola

Word family

rotundal (adjective, rare) · rotundity (noun, referring to roundness)

A common mistake

Learners sometimes confuse rotunda with rotund (meaning round/plump). While both derive from Latin rotundus, rotunda is specifically architectural; rotund describes shape in general or a person's build.

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