Definition of “sea” - English Dictionary

british 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:

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)