History
History
History
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Meaning:
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the level of sea halfway between high and low tide, used as the basis for measuring height of land and depth of sea

ocean's surface

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Cases of word usage

1) a measurement from bottom to top; the distance to the top of something, especially from sea-level or the ground (height)

2) a large area of level land high above sea-level (plateau)

SEA-LEVEL as in Wiktionary
SEA-LEVEL as in Wikipedia