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ocean

/ˈəʊ.ʃən/
/ˈoʊ.ʃən/

noun

One of the large bodies of water separating the continents.

Water belonging to an ocean.
The island is surrounded by ocean

An immense expanse; any vast space or quantity without apparent limits.
an ocean of affairs

A blue colour, like that of the ocean (also called ocean blue).