The Collaborative International Dictionary of English v.0.48:

Sea \Sea\ (s[=e]), n. [OE. see, AS. s[=ae]; akin to D. zee, OS.
   & OHG. s[=e]o, G. see, OFries. se, Dan. s["o], Sw. sj["o],
   Icel. saer, Goth. saiws, and perhaps to L. saevus fierce,
   savage. [root]151a.]
   1. One of the larger bodies of salt water, less than an
      ocean, found on the earth's surface; a body of salt water
      of second rank, generally forming part of, or connecting
      with, an ocean or a larger sea; as, the Mediterranean Sea;
      the Sea of Marmora; the North Sea; the Carribean Sea.
      [1913 Webster]

   2. An inland body of water, esp. if large or if salt or
      brackish; as, the Caspian Sea; the Sea of Aral; sometimes,
      a small fresh-water lake; as, the Sea of Galilee.
      [1913 Webster]

   3. The ocean; the whole body of the salt water which covers a
      large part of the globe.
      [1913 Webster]

            I marvel how the fishes live in the sea. --Shak.
      [1913 Webster]

            Ambiguous between sea and land
            The river horse and scaly crocodile.  --Milton.
      [1913 Webster]

   4. The swell of the ocean or other body of water in a high
      wind; motion or agitation of the water's surface; also, a
      single wave; a billow; as, there was a high sea after the
      storm; the vessel shipped a sea.
      [1913 Webster]

   5. (Jewish Antiq.) A great brazen laver in the temple at
      Jerusalem; -- so called from its size.
      [1913 Webster]

            He made a molten sea of ten cubits from brim to
            brim, round in compass, and five cubits the height
            thereof.                              --2 Chron. iv.
                                                  2.
      [1913 Webster]

   6. Fig.: Anything resembling the sea in vastness; as, a sea
      of glory. --Shak.
      [1913 Webster]

            All the space . . . was one sea of heads.
                                                  --Macaulay.
      [1913 Webster]

   Note: Sea is often used in the composition of words of
         obvious signification; as, sea-bathed, sea-beaten,
         sea-bound, sea-bred, sea-circled, sealike, sea-nursed,
         sea-tossed, sea-walled, sea-worn, and the like. It is
         also used either adjectively or in combination with
         substantives; as, sea bird, sea-bird, or seabird, sea
         acorn, or sea-acorn.
         [1913 Webster]

   At sea, upon the ocean; away from land; figuratively,
      without landmarks for guidance; lost; at the mercy of
      circumstances. "To say the old man was at sea would be too
      feeble an expression." --G. W. Cable

   At full sea at the height of flood tide; hence, at the
      height. "But now God's mercy was at full sea." --Jer.
      Taylor.

   Beyond seas, or Beyond the sea or Beyond the seas
      (Law), out of the state, territory, realm, or country.
      --Wharton.

   Half seas over, half drunk. [Colloq.] --Spectator.

   Heavy sea, a sea in which the waves run high.

   Long sea, a sea characterized by the uniform and steady
      motion of long and extensive waves.

   Short sea, a sea in which the waves are short, broken, and
      irregular, so as to produce a tumbling or jerking motion.


   To go to sea, to adopt the calling or occupation of a
      sailor.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ocean \O"cean\ ([=o]"shan), n. [F. oc['e]an, L. oceanus, Gr.
   'wkeano`s ocean, in Homer, the great river supposed to
   encompass the earth.]
   1. The whole body of salt water which covers more than three
      fifths of the surface of the globe; -- called also the
      sea, or great sea.
      [1913 Webster]

            Like the odor of brine from the ocean
            Comes the thought of other years.     --Longfellow.
      [1913 Webster]

   2. One of the large bodies of water into which the great
      ocean is regarded as divided, as the Atlantic, Pacific,
      Indian, Arctic and Antarctic oceans.
      [1913 Webster]

   3. An immense expanse; any vast space or quantity without
      apparent limits; as, the boundless ocean of eternity; an
      ocean of affairs. --Locke.
      [1913 Webster]

            You're gonna need an ocean
            Of calamine lotion.                   --Lieber &
                                                  Stoller
                                                  (Poison Ivy:
                                                  song lyrics,
                                                  1994)
      [PJC]

WordNet (r) 3.0 (2006):

sea
    n 1: a division of an ocean or a large body of salt water
         partially enclosed by land
    2: anything apparently limitless in quantity or volume [syn:
       ocean, sea]
    3: turbulent water with swells of considerable size; "heavy
       seas"

Moby Thesaurus II by Grady Ward, 1.0:

97 Moby Thesaurus words for "sea":
   abundance, acres, bags, barrels, big drink, billow, blue,
   blue water, bore, breakers, brine, briny, bushel, chop, choppiness,
   chopping sea, comb, comber, copiousness, countlessness, deep,
   dirty water, drink, eagre, flood, gravity wave, ground swell,
   heave, heavy sea, heavy swell, high sea, high seas, hydrosphere,
   lift, load, lop, main, main sea, mass, mountain, much, multitude,
   numerousness, ocean, ocean depths, ocean main, ocean sea, oceans,
   peak, peck, plenitude, plenty, popple, profusion, quantities,
   quantity, riffle, ripple, rise, roll, roller, rough water,
   salt sea, salt water, scend, send, spate, superabundance,
   superfluity, surf, surge, swell, thalassa, the bounding main,
   the brine, the briny, the briny deep, the deep, the deep sea,
   the seven seas, the vasty deep, tidal bore, tidal wave, tide,
   tide wave, tons, trough, tsunami, undulation, volume, water wave,
   wave, wavelet, white horses, whitecaps, world, worlds



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SEA
       Self-Extracting Archive


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SEA
       Society for Electronic Access (org.)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SEA
       System Enhancement Associates (manufacturer)


The Free On-line Dictionary of Computing (30 December 2018):

Self Extracting Archive
SEA

    (SEA) An archive format used on the Apple
   Macintosh.  Double-clicking a file of this type should
   extract its contents.

   (1995-05-02)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

SEA. The ocean; the great mass of waters which surrounds the land, and which
probably extends from pole to pole, covering nearly three quarters of the
globe. Waters within the ebb and flow of the tide, are to be considered the
sea. Gilp. R. 526.
     2. The sea is public and common to all people, and every person has an
equal right to navigate it, or to fish there; Ang. on Tide Wat. 44 to 49;
Dane's Abr. c. 68, a. 3, 4; Inst. 2, 1, 1; and to land upon the sea, shore.
(q.v.)
     3. Every nation has jurisdiction to the distance of a cannon shot, (q,
v.) or marine league, over the water adjacent to its shore. 2 Cranch, 187,
234; 1 Circuit Rep. 62; Bynk. Qu. Pub. Juris. 61; 1 Azuni Mar. Law, 204; Id.
185; Vattel, 207: