Curvature
Curvature is the amount an object deviates from being flat. Given any curve C and a point P on it, there is a unique circle or line which most closely approximates the curve near P\. The curvature of C at P is then defined to be the curvature of that circle or line. The radius of curvature is defined as the reciprocal of the curvature.
Source
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"Osculating circle."
http://en.wikipedia.org/wiki/File:Osculating_circle.svg
Wikipedia
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