Concavity (noun)

1. The state or quality of being concave or curved inward.
2. A concave surface or curve.

Origin:

Late 17th century: from latin concavus "hollow, curved inward".

Examples:

1. The concavity of the lens was adjusted to focus the light correctly.
2. The concavity of the dish helped to collect the liquid.
3. The concavity of the hull was designed to increase stability in rough waters.
4. The concavity of the mold was used to create the desired shape of the object.
5. The concavity of the curve was used to describe the shape of the function.