n.
 a very large expanse of sea, in particular, each of the Atlantic, Pacific, Indian, Arctic, and Antarctic oceans. 
▸
(the ocean)
 N. Amer. the sea.
 
  Derivative
  
    - oceanward adv. & adj.
  - oceanwards adv.
 
   
  Etymology
  ME: from OFr. occean, via L. from Gk ōkeanos ‘great stream encircling the earth's disc’.