the salt waters that cover the greater part of the earth's surface.
a division of these waters, of considerable extent, more or less definitely marked off by land boundaries: the North Sea.
one of the seven seas; ocean.
a large lake or landlocked body of water.
the degree or amount of turbulence of the ocean or other body of water, as caused by the wind.
the waves.
a large wave: The heavy seas almost drowned us.
a widely extended, copious, or overwhelming quantity: a sea of faces; a sea of troubles.
the work, travel, and shipboard life of a sailor: The sea is a hard life but a rewarding one.
Astronomy, mare3.
of, relating to, or adapted for use at sea.
at sea,
on the ocean.
perplexed; uncertain: completely at sea as to how to answer the question.
Also, asea.
follow the sea, to pursue a nautical career: Many boys then dreamed of following the sea.
go to sea,
to set out on a voyage.
to embark on a nautical career.
half seas over, Slang. partly or completely drunk: They came home at dawn, looking half seas over. Also, half-seas over.
put to sea, to embark on a sea voyage: The expedition is nearly ready to put to sea. Also, put out to sea.

before 900; Middle English see, Old English sǣ; cognate with Dutch zee, German See, Old Norse sær sea, Gothic saiws marsh

8. multitude, host, abundance, mass. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
sea (siː)
1.  a.  the sea the mass of salt water on the earth's surface as differentiated from the landRelated: marine, maritime, thalassic
 b.  (as modifier): sea air
2.  (capital when part of place name)
 a.  one of the smaller areas of ocean: the Irish Sea
 b.  a large inland area of water: the Caspian Sea
3.  turbulence or swell, esp of considerable size: heavy seas
4.  (capital when part of a name) astronomy See also mare any of many huge dry plains on the surface of the moon
5.  anything resembling the sea in size or apparent limitlessness
6.  the life or career of a sailor (esp in the phrase follow the sea)
7.  at sea
 a.  on the ocean
 b.  in a state of confusion
8.  go to sea to become a sailor
9.  put to sea, put out to sea to embark on a sea voyage
Related: marine, maritime, thalassic
[Old English sǣ; related to Old Norse sǣr, Old Frisian sē, Gothic saiws, Old High German sēo]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. sæ "sheet of water, sea, lake," from P.Gmc. *saiwaz (cf. O.S. seo, O.Fris. se, M.Du. see), of unknown origin, outside connections "wholly doubtful" (Buck). Gmc. languages also use the general IE word (represented by Eng. mere), but have no firm distinction between "sea" and "lake," either
by size or by salt vs. fresh. This may reflect the Baltic geography where the languages are thought to have originated. The two words are used more or less interchangeably, and exist in opposite senses (e.g. Goth. saiws "lake," marei "sea;" but Du. zee "sea," meer "lake"). Cf. also O.N. sær "sea," but Dan. sø, usually "lake" but "sea" in phrases. Ger. See is "sea" (fem.) or "lake" (masc.). Meaning "dark area of the moon's surface" is attested from 1667 (see mare (2)). Phrase sea change "transformation" is attested from 1610, first in Shakespeare ("The Tempest," I.ii). Sea legs is from 1712; sea serpent attested from 1646; sea level first recorded 1806. At sea in the fig. sense of "perplexed" is attested from 1768, from lit. sense of "out of sight of land."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
sea   (sē)  Pronunciation Key 
  1. The continuous body of salt water that covers most of the Earth's surface.

  2. A region of water within an ocean and partly enclosed by land, such as the North Sea. See Note at ocean.

  3. A large body of either fresh or salt water that is completely enclosed by land, such as the Caspian Sea.

  4. Astronomy A mare.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
  1. Seattle Mariners

  2. Seattle Seahawks

  3. Seattle-Tacoma International Airport

  4. solar elevation angle

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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