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Synonyms
cur·va·ture (kûŕvə-chŏŏŕ, -chər)

[Middle English, from Latin curvātūra, from curvātus past participle of curvāre, to bend, from curvus, curved.]

noun 

  1. The act of curving or the state of being curved.
  2. Mathematics
    1. The ratio of the change in the angle of a tangent that moves over a given arc to the length of the arc.
    2. The limit of this ratio as the length of the arc approaches zero.
    3. The reciprocal of the radius of a circle.
  3. Medicine A curving or bending, especially an abnormal one: curvature of the spine.