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The word concave means curving in or hollowed inward, as opposed to convex. The former may be used in reference to:
- Concave lens, a lens with inward-curving (concave) surfaces
- Concave polygon, a polygon which is not convex
- Concave function, a type of function which is related to convex functions
- Concave mirror
- Concave set
- Concave football boot, a football boot company
|Look up concave or concavity in Wiktionary, the free dictionary.|
- Convex (disambiguation), the opposite of concave
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