Longman Dictionary of Contemporary English homepage

sea level

 noun
     
Related topics: Geography, Measurement
sea level [uncountable]
TM the average height of the sea, used as a standard for measuring other heights and depths, such as the height of a mountain
above/below sea level
1000m above sea level
changes in sea level
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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