Definitions from Wiktionary ( )

▸ adjective:  Curved like the inner surface of a sphere or bowl.
▸ adjective:  (geometry, not comparable, of a polygon) Not convex; having at least one internal angle greater than 180 degrees.
▸ adjective:  (functional analysis, not comparable, of a real-valued function on the reals) Satisfying the property that all segments connecting two points on the function's graph lie below the function.
▸ adjective:  Hollow; empty.
▸ noun:  A concave surface or curve.
▸ noun:  The vault of the sky.
▸ noun:  One of the celestial spheres of the Ptolemaic or geocentric model of the world.
▸ noun:  (manufacturing) An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
▸ noun:  (surfing) An indentation running along the base of a surfboard, intended to increase lift.
▸ noun:  (skateboarding) An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
▸ noun:  (gambling) A playing card made concave for use in cheating.
▸ verb:  To render concave, or increase the degree of concavity.

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