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English definition of “sea”

sea

noun [C/U]  /si/ us  
a large area of salt water that is partly or completely surrounded by land, or the salt water that covers most of the surface of the earth: [C] the Caribbean/Mediterranean Sea [C] The seas are filled with creatures we know nothing about. If you travel by sea, you go in a ship.
(Definition of sea from the Cambridge Academic Content Dictionary © Cambridge University Press)
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