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Definition of concavity noun from the Oxford Advanced American Dictionary

     

    concavity

     noun
    noun
    NAmE//kɑnˈkævət̮i//
     
    (pl. concavities) (technology)
     
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  1. 1[uncountable] the quality of being concave (= curving in) Rocks exposed to wind often show some degree of concavity.
  2. 2[countable] a shape or place that curves in a deep concavity in the side of the hill
See the Oxford Advanced Learner's Dictionary entry: concavity