from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The level of the ocean's surface, especially the level halfway between mean high and low tide, used as a standard in reckoning land elevation or sea depths.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The nominal height of the surface of the oceans above which heights of geographical features and aircraft flight levels are measured.

from the GNU version of the Collaborative International Dictionary of English

  • The level of the surface of the sea; any surface on the same level with the sea.

from The Century Dictionary and Cyclopedia

  • n. The surface of the sea, supposed to be level: commonly used as equivalent to mean sea-level, the level surface half-way between mean high and low water.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. 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
  • adj. lying below the normal level


Sorry, no etymologies found.


  • A modest drop in sea level would have reduced the distance between Timor and Flores, at a place called Ombai Strait, to perhaps five or ten miles.

    The Song of The Dodo

  • The city of Kabul sits six thousand feet above sea level and is rimmed by snow-tipped mountains.

    The Longest War

  • During a subsequent glaciation, when the sea level again fell, some individuals of Micropanthera balica might have roamed back across the muddy isthmus to Java.

    The Song of The Dodo

  • Thirteen or fourteen thousand years ago, during the last glacial episode of the Pleistocene, when the sea level stood several hundred feet lower than it presently does, Tasmania was the high-elevation knob of a knob-ended peninsula.

    The Song of The Dodo

  • He took them to be the truncated lower ends of old New Guinea drainages, left behind when geological slumping caused the upriver reaches to subside below sea level and leave Aru insularized on the shelf.

    The Song of The Dodo

  • The most unlikely option was the easternmost route, the Khawak Pass, at twelve thousand feet above sea level the highest and most difficult trail north through the Hindu Kush into Bactria.

    Alexander the Great

  • Clifford Wenkins's dampness extended to his brow, though the sunshine at 6,000 feet above sea level was decidedly chilly.


  • At sea level you've got a couple hundred miles per hour to play with, but at fifty or sixty thousand feet, your stall speed's maybe five hundred knots per hour and your Mach buffet's about five forty.

    The Coffin Dancer

  • "I take it we reach ten metres below sea level as quickly as we can, then ditch the umbilical and switch to rebreathers."

    Crusader Gold

  • Camp John Hay was pleasantly located one mile above sea level amongst the pine trees of Mountain Province in Baguio, the summer capital of the Philippines.

    Blood Brothers


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