Meaning ofconcavein English

Adjective

1. curved inward like a sphere's interior
   The concave shape of the lens focuses light inward.
2. having an internal angle greater than 180 degrees; not convex
   The architect designed a concave roof with an internal angle of 210 degrees.
3. a function with segments below its graph
   The mathematician studied a concave function with a downward-facing curve.