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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"
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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"
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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"
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a superficial aspect as opposed to the real nature of something;
"it was not what it appeared to be on the surface"
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information that has become public;
"all the reports were out in the open"
"the facts had been brought to the surface"
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a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight
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