Ocean n. : 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.

Ocean n. : 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.

Ocean n. : An immense expanse; any vast space or quantity without apparent limits; as, the boundless ocean of eternity; an ocean of affairs.

Ocean a. : Of or pertaining to the main or great sea; as, the ocean waves; an ocean stream.

Example:
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Taxonomy
ocean, World Ocean, liquid water, thermohaline circulation, body of water, Earth's, divisions, body, trench, lies, supercontinent, square kilometres, free encyclopedia, Maps, Atlantic, Ancient oceans, plate, Titan.

Defination from the web:
ocean is divided into a number of principal areas. ... Indian Ocean, which washes upon southern Asia and separates Africa and Australia ...