noun
the outside part or uppermost layer of something
verb
to rise or come to the surface of a body of water or land
adjective
relating to or occurring on the surface
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The scientist conducted experiments to study the properties of the surface tension of liquids.
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Make sure you clean the surface of the table before setting the dishes.
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I can't believe she threw shade at me right on the surface.
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Beneath the surface of his calm demeanor, he was actually quite anxious.