definition of
surface

[1] #1 surface n. the outer boundary of an artifact or a material layer constituting or resembling such a boundary; "there is a special cleaner for these surfaces"; "the cloth had a pattern of red dots on a white surface". wn

[2] #2 surface n. the extended two-dimensional outer boundary of a three-dimensional object; "they skimmed over the surface of the water"; "a brush small enough to clean every dental surface"; "the sun has no distinct surface". wn

[3] #3 surface n. [Earth's surface] the outermost level of the land or sea; "earthquakes originate far below the surface"; "three quarters of the Earth's surface is covered by water". wn

[4] #4 surface n. a superficial aspect as opposed to the real nature of something; "it was not what it appeared to be on the surface". wn

[5] #5 surface a. on the surface; "surface materials of the moon". wn