Ocean is defined as the body of salt water covering much of the Earth or a large quantity of something.
See ocean in Webster's New World College Dictionary
Origin: ME occean < OFr < L Oceanus < Gr Ōkeanos, the outer sea (in contrast to the Mediterranean), orig. thought of as a great river flowing around the earth
See ocean in American Heritage Dictionary 4
Origin: Middle English occean
Origin: , from Old French
Origin: , from Latin ōceanus
Origin: , from Greek Ōkeanos, the god Oceanus, a great river encircling the earth.
Learn more about ocean