• curved like the inner surface of a sphere or bowl
  • not convex; having at least one internal angle greater than 180 degrees.
  • satisfying the property that all segments connecting two points on the function's graph lie below the function.
  • hollow; empty


  • A concave surface or curve.
  • The vault of the sky.
  • One of the celestial spheres of the Ptolemaic or geocentric model of the world.
  • An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
  • An indentation running along the base of a surfboard, intended to increase lift.
  • An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
  • A playing card made concave for use in cheating.


  • To render concave, or increase the degree of concavity.


Opposite words


  • From Middle English concave, from Old French concave, from Latin concavus.

Modern English dictionary

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