Curvature (noun)

1. The quality of being curved.
2. The degree to which a surface or line deviates from being straight.

Origin:

Late 17th century: from latin curvatura, from curvare "to bend".

Examples:

1. The curvature of the road was difficult for the driver to navigate.
2. The curvature of the earth can be seen from space.
3. The curvature of the bridge was designed to withstand strong winds.
4. The curvature of the coastline was beautiful and inviting.
5. The curvature of the glass was carefully measured to ensure a perfect fit.