Definition of: surface

(sûr′fis) noun
1. The exterior part or face of anything that has length, breadth, and thickness.
2. That which has length and breadth, but not thickness; a superficies.
3. A superficial aspect; external view or appearance.
4. That portion of the side of a fortification which is bounded by the angle of the nearest bastion and the prolongation of the flank.
—v. ·faced, ·fac·ing v.t.
1. To put a surface on; especially, to make smooth, even, or plain.
—v.i.
2. To mine at or near the surface.
3. To rise to the surface, as a submarine. [<F <sur- above + face FACE]
—sur′fac·er noun