Source : Webster's Revised Unabridged Dictionary (1913)

Ocean \O"cean\, n. [F. oc['e]an, L. oceanus, Gr.? 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}.

            Like the odor of brine from the ocean Comes the
            thought of other years.               --Longfellow.

   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.

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

Ocean \O"cean\, a.
   Of or pertaining to the main or great sea; as, the ocean
   waves; an ocean stream. --Milton.

Source : WordNet®

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