The Collaborative International Dictionary of English v.0.48:

Ocean \O"cean\ ([=o]"shan), a.
   Of or pertaining to the main or great sea; as, the ocean
   waves; an ocean stream. --Milton.
   [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):

ocean
    n 1: a large body of water constituting a principal part of the
         hydrosphere
    2: anything apparently limitless in quantity or volume [syn:
       ocean, sea]

The Devil's Dictionary (1881-1906):

OCEAN, n.  A body of water occupying about two-thirds of a world made
for man -- who has no gills.