1874, L J V. Gerard, The elements of geometry, in eight books; or, First step in applied logic, page 106,The points of intangence, or extangence, of two circumferences are the points of tangence of their intangents, or extangents.
1957, Canadin Patent Office, The Canadian Patent Office Record and Register of Copyrights, Volume 85, Issues 10-12, page 8721,...to assure the belt passes only through said points of tangence,....
2006, ACM Symposium on Solid and Physical Modeling: Proceedings, page 185,The latter enables designers and engineers to describe geometric entities (points, lines, planes, curves, surfaces) by specification of constraints: distances, angles, incidences, tangences between geometric entities.
