1. 弯曲;曲度;(尤指)圆弧
The curvature of something is its curved shape, especially when this shape is part of the circumference of a circle.

1. the property possessed by the curving of a line or surface

Synonym: curve

2. the rate of change (at a point) of the angle between a curve and a tangent to the curve

3. (medicine) a curving or bending
often abnormal

e.g. curvature of the spine