noun (n)

• (medicine) a curving or bending; often abnormal(noun.state)

  Example:
  Curvature of the spine.
  

  source: wordnet30
• the rate of change (at a point) of the angle between a curve and a tangent to the curve(noun.attribute)

  source: wordnet30
• the property possessed by the curving of a line or surface(noun.attribute)

  Synonym:
  curve
  

  source: wordnet30
• The act of curving, or the state of being bent or curved; a curving or bending, normal or abnormal, as of a line or surface from a rectilinear direction; a bend; a curve.(noun)

  source: webster1913