sea Definition in Cambridge British English Dictionary
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Definition of "sea" - British English Dictionary

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seanoun

uk   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 river estuary 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 Learners Dictionary & Thesaurus © Cambridge University Press)
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