(geometry) A compact Riemann surface with precisely 84(g − 1) automorphisms, where g is the genus of the surface. This number is maximal by virtue of Hurwitz's theorem on automorphisms.

(linguistics) Any valid analysis of a word's morphology regardless of whether it represents its etymology in the strict sense of that word (that is, the historical origin); for example, the word biology has a surface analysis of bio- + -logy although it was not coined as the combination of those combining forms (in fact predating them). The word can validly be viewed as an example of words ending in the suffix -ology even though it was not coined as one (whereas many analogous but newer words were thus coined, such as immunology).

(surface science, materials science) The analysis of a physical surface (uncountable) or any instance of such analysis (countable). / (meteorology) See surface weather analysis.

(biochemistry) All the surface proteins of a cell or organism

plural of surface integral

(mathematics) An integral over a 2-dimensional domain

(geometry) All of the sides of the object, excluding its base and top (when they exist).

A partial discharge that appears at the boundary of different insulators when there are changes in the electric field.

(stellar astronomy) The outer edge of the corona. The boundary that separates a star's atmosphere from its exosphere (heliosphere, astrosphere), where Alfven waves transition into stellar wind (solar wind).

(nautical, military) A warship that floats on the surface of the ocean, as opposed to a submarine. Aircraft carriers are also generally excluded.