1. the quality or state of being concave; a curved inward surface or shape
2. a concave surface, line, or space; a hollow area

Examples

• The concavity of the mirror created a distorted reflection.
• She traced the gentle concavity of the bowl with her finger.
• The architect designed the building’s facade with subtle concavities.
• The concavity in the rock face collected rainwater.
• Students learned to identify concavity and convexity in geometric shapes.
• The spoon’s concavity made it perfect for serving soup.