{"data":{"fields":"term_definition","term_definition":"<div class=\"definition\">Contacting surfaces which consist of 1) two surfaces which are straight in a given cross section containing both the same contact normal; or 2) two surfaces, one of which is convex and the other is concave in a given cross section containing both the same contact normal.Conformal surfaces must satisfy either 1) or 2) in all cross sections.<\/div>"}}