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Stage 1 of 3
rotundus
Latin · ancient
"round, circular"
round, circular, from rota (a wheel)
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Stage 2 of 3
rotonda
Italian · 1600s
"a round domed building"
settled in Italian for a round building, especially one topped by a dome
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Stage 3 of 3
rotunda
English · 1700s
"a round building or room, especially domed"
adopted directly for a round, often domed building or room
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