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Meaning of “sea” in the English Dictionary

"sea" in British English

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seanoun

uk   /siː/  us   /siː/
A1 [C or U] the salty water that covers a large part of the surface of the earth, or a large area of salty water, smaller than an ocean, that is partly or completely surrounded by land: the Mediterranean Sea We went swimming in the sea. The sea was calm/smooth/choppy/rough when we crossed the Channel. The refugees were at sea (= in a boat on the sea a long way from land) for 40 days before reaching land. When we moved to the US, we sent our things by sea (= in a ship). We spent a week by the sea (= on the coast) this year. Soon we had left the marina and were heading towards the open sea (= the part of the sea a long way from land).
a sea of sth
a large amount or number of something: The teacher looked down and saw a sea of smiling faces.
put (out) to sea
(of a ship) to leave a port and start a journey: The boats will put (out) to sea on this evening's high tide.
[C] one of the large, flat areas on the moon that in the past were thought to be seas

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(Definition of sea from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sea" in American English

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seanoun [C/U]

 us   /si/
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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