• the outside part or uppermost layer of something

Synonyms: outside, exterior

• a continuous set of points that has length and breadth but no thickness

• relating to or found on the surface of something

Synonyms: superficial, external, exterior, outward, seeming, ostensible, apparent, cosmetic, skin deep

• rise or come up to the surface of the water or the ground

Synonyms: come to the surface, come to the top, come up, rise

• provide (something, especially a road) with a particular surface