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curvature (n.)

"continuous bending, the essential characteristic of a curve," 1660s, from Latin curvatura "a bending," from curvatus, past participle of curvare "to bend," from PIE root *sker- (2) "to turn, bend." In non-Euclidian geometry, from 1873.

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Definitions of curvature from WordNet

curvature (n.)
(medicine) a curving or bending; often abnormal;
curvature of the spine
curvature (n.)
the rate of change (at a point) of the angle between a curve and a tangent to the curve;
curvature (n.)
the property possessed by the curving of a line or surface;
Synonyms: curve
From wordnet.princeton.edu