concavity
noun/kɒnˈkævəti/
/kɑːnˈkævəti/
(plural concavities)
(specialist)- [uncountable] the quality of being concave (= curving in)
- Rocks exposed to wind often show some degree of concavity.
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- [countable] a shape or place that curves in
- a deep concavity in the side of the hill
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concavity