"curvature" in the noun sense
1. curvature
medicine) a curving or bending often abnormal
"curvature of the spine"
2. curvature
the rate of change (at a point) of the angle between a curve and a tangent to the curve
3. curvature, curve
the property possessed by the curving of a line or surface
Source: WordNet® (An amazing lexical database of English)
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