What does "ocean" mean?

Ocean: 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.

Additional senses

  1. 2.An immense expanse; any vast space or quantity without apparent limits; as, the boundless ocean of eternity; an ocean of affairs. Locke.
  2. 3.Of or pertaining to the main or great sea; as, the ocean waves; an ocean stream. Milton.

Sources