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.-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.-an immense expanse; any vast space or quantity without apparent limits; as, the boundless ocean of eternity; an ocean of affairs.-of or pertaining to the main or great sea; as, the ocean waves; an ocean stream.