surface Definition in Cambridge American English Dictionary
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Definition of "surface" - American English Dictionary

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surfacenoun [C]

 us   /ˈsɜr·fəs/
the outer or top part or layer of something: the earth’s surface a rough/smooth surface Try to find a level surface on the ground where you can spread out your sleeping bags. There was very little wind, and the surface of the water was calm. mathematics A surface is also a flat shape or area. The surface can also be what is obvious about a person or situation rather than truer or more important facts that are hidden or hard to see: But the fear that lurks just below the surface emerges quickly in talks with villagers. That may seem absurd on the surface, but in a few years it will seem like wisdom.

surfaceverb [I]

 us   /ˈsɜr·fəs/
to appear at the surface of something: The ducks would dive to the bottom of the lake and surface a minute or two later yards away. If a feeling or information surfaces, it becomes known: This story first surfaced about a week ago.

surfaceadjective [not gradable]

 us   /ˈsɜr·fəs/
using the surface of the land or sea: When you land in the airport, look for signs directing you to surface transportation to get a bus to the city. If you send it overseas by surface mail, it will take forever.
(Definition of surface from the Cambridge Academic Content Dictionary © Cambridge University Press)
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