superficies UK /ˌsuː.pəˈfɪʃ.i.iːz/US /ˌsu.pɚˈfɪˌʃiz/ noun5 •A two-dimensional magnitude that has length and breadth; especially such a surface that forms the boundary of a solid. •The visible, external surface of a body.The Superficies was composed of several bits of Wood, about the bigness of a Dye, but some larger than others. — 1726 •The surface (of something immaterial, especially of the mind or soul). •The area of a two-dimensional surface. •A building intimately associated with the land on which it is built.