Etymology
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sea-level (n.)

"the mean surface of the sea," presumed to be level, halfway between the mean high and low water; by 1806, see sea + level (n.). Sea-line for "the horizon at sea" is by 1680s.

updated on March 15, 2022

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Definitions of sea-level from WordNet

sea-level (adj.)
lying below the normal level;
Synonyms: low-lying
From wordnet.princeton.edu, not affiliated with etymonline.