<p><strong>Noun</strong></p><ul><li>the outer face, outside, or exterior boundary of a thing; outermost or uppermost layer or area.</li><li>any face of a body or thing: the six surfaces of a cube.</li><li>extent or area of outer face; superficial area.</li><li>the outward appearance, especially as distinguished from the inner nature: to look below the surface of a matter.</li><li>Geometry. any figure having only two dimensions; part or all of the boundary of a solid.</li><li>land or sea transportation, rather than air, underground, or undersea transportation.</li><li>Aeronautics. an airfoil.</li></ul><p><strong>Adjective</strong></p><ul><li>of, on, or pertaining to the surface; external.</li><li>apparent rather than real; superficial: to be guilty of surface judgments.</li><li>of, relating to, or via land or sea: surface mail.</li><li>Linguistics. belonging to a late stage in the transformational derivation of a sentence; belonging to the surface structure.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>surfaced, surfacing. to finish the surface of; give a particular kind of surface to; make even or smooth.</li><li>to bring to the surface; cause to appear openly: Depth charges surfaced the sub. So far we've surfaced no applicants.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>surfaced, surfacing. to rise to the surface: The submarine surfaced after four days.</li><li>to work on or at the surface.</li></ul>