curvaturePronunciation: /ˈkəːvətʃə/Definition of curvature noun [mass noun] the fact of being curved or the degree to which something is curved:spinal curvature the curvature of the earth Geometry the degree to which a curve deviates from a straight line, or a curved surface deviates from a plane. a numerical quantity expressing curvature. Origin: late Middle English: via Old French from Latin curvatura, from curvare (see curve)curvature in other Oxford dictionaries Definition of curvature in the US English dictionary