The outward curve or convex shape of something; the degree to which something curves outward.
From excurve + -ature, combining the Latin excurvare with -atura, a suffix indicating result or state. This is a variant noun form alongside excurvation, emphasizing the shape itself rather than the process.
Architects and engineers use this term when designing arches and domes—they calculate the exact excurvature needed so the structure can support weight while remaining beautiful, a balance ancient Romans perfected with the Pantheon.
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