Definition of sea level noun from the Oxford Advanced Learner's Dictionary

 

sea level

 noun
noun
BrE
 
; NAmE
 
[uncountable] Coastlines and the sea
 
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the average height of the sea/ocean, used as the basis for measuring the height of all places on land 50 metres above sea level See related entries: Coastlines and the sea
See the Oxford Advanced American Dictionary entry: sea level