Englishfor English speakers
constancy
Noun
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Constancy is steadfastness, faithfulness, loyalty
His constancy to our cause is heartening.
of
Preposition
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Made using.
It is a house of cards.
curvature
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noun
(= curve)
the property possessed by the curving of a line or surface
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noun
the rate of change (at a point) of the angle between a curve and a tangent to the curve
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noun
(medicine) a curving or bending; often abnormal
curvature of the spine