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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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Who Said that ?
Dreams pass into the reality of action. From the actions stems the dream again; and this interdependence produces the highest form of living. - Click here to find out.
Fact of the day
If you yelled for 8 years, 7 months and 6 days, you would have produced enough sound energy to heat one cup of coffee.