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concavity
'concavity' - used as a noun
1. a shape that curves or bends inward
2. the property possessed by a concave shape
Variations of 'concavity'
 
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The trouble with the rat race is that even if you win, you're still a rat. - Click here to find out.
Fact of the day
Mass murderer Charles Manson recorded an album titled "Lie."