Meaning of OCEAN in English

OCEAN

[noun] [U] - a very large area of seaThese mysterious creatures live at the bottom of the ocean.The word 'Ocean' is also used in the name of each of the world's five main areas of sea.the Atlantic/Pacific/Indian/Arctic/Antarctic Ocean(dated) Oceans of means a lot of.Don't worry - we've got oceans of time.

Cambridge English vocab.      Кембриджский английский словарь.