the outer face, outside, or exterior boundary of a thing; outermost or uppermost layer or area.

any face of a body or thing

the six surfaces of a cube.

extent or area of outer face; superficial area.

the outward appearance, esp. as distinguished from the inner nature

to look below the surface of a matter.

Geometry . any figure having only two dimensions; part or all of the boundary of a solid.

land or sea transportation, rather than air, underground, or undersea transportation.

Aeronautics . an airfoil.

of, on, or pertaining to the surface; external.

apparent rather than real; superficial

to be guilty of surface judgments.

of, pertaining to, or via land or sea

surface mail.

Linguistics . belonging to a late stage in the transformational derivation of a sentence; belonging to the surface structure.

to finish the surface of; give a particular kind of surface to; make even or smooth.

to bring to the surface; cause to appear openly

Depth charges surfaced the sub. So far we've surfaced no applicants.

to rise to the surface

The submarine surfaced after four days.

to work on or at the surface.