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Where does a dome end and a cupola begin?

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Why It Is Open
A dome is closely related to the cupola, and the terms overlap in use: cupola can mean a small dome-like structure crowning a roof or turret, or it can serve as a near-synonym for dome itself, so historians and reference works have not settled a single boundary between the two. 1
What Would Resolve This
A single technical definition distinguishing dome from cupola by a specific criterion, such as scale, structural role or position on the building, applied consistently across architectural historians and reference works. 1
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A dome is closely related to the cupola, and the terms overlap in use: cupola can mean a small dome-like structure crowning a roof or turret, or it can serve as a near-synonym for dome itself, so historians and reference works have not settled a single boundary between the two.

What would resolve this A single technical definition distinguishing dome from cupola by a specific criterion, such as scale, structural role or position on the building, applied consistently across architectural historians and reference works.
OpenDome (Wikipedia)
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Source Dome (Wikipedia)
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1. Dome (Wikipedia)
Wikimedia FoundationLead section, cupola overlap and definitional controversy
Quote, Lead section, cupola overlap and definitional controversy
There is significant overlap with the term cupola, which may also refer to a dome or a structure on top of a dome. The precise definition of a dome has been a matter of controversy and there are a wide variety of forms and specialized terms to describe them.
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