Cambridge Advanced Learner's Dictionary
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Definition
sea noun
/siː/ n
•
[C or U] the salty water which covers a large part of the surface of the Earth, or a large area of salty water, smaller than an ocean, which 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 forty days before reaching land.
When we moved to the US, we sent our things by sea (= in a ship).
We spent a lovely 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 which in the past were thought to be seas
(Definition of sea noun from the Cambridge Advanced Learner's Dictionary)
