concavity
Definitions
The state or quality of being concave; a hollowed-out or inward-curving shape.
A concave surface or area; a depression or indentation.
Examples
The architect designed the roof with a slight concavity to help channel rainwater into the collection system.
The lens is characterized by its distinct concavity, which helps to diverge incoming light rays.
Geologists studied the concavity of the crater to determine the angle at which the meteorite struck the surface.