Sea level

noun

Definitions

Noun
  1. 1
    The nominal height of the surface of the oceans above which heights of geographical features and aircraft flight levels are measured. countable, uncountable

    "The summit of Everest is 5.5 miles above sea level."

  2. 2
    level of the ocean's surface (especially that halfway between mean high and low tide); used as a standard in reckoning land elevation or sea depth wordnet

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