n the outer boundary of an artifact or a material layer constituting or resembling such a boundary
n the extended two-dimensional outer boundary of a three-dimensional object
n the outermost level of the land or sea
n a superficial aspect as opposed to the real nature of something
n information that has become public
n a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight
v come to the surface
v put a coat on; cover the surface of; furnish with a surface
v appear or become visible; make a showing