Meaning of “ocean” in the English Dictionary

american-english dictionary
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"ocean" in British English

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oceannoun

uk /ˈəʊ.ʃən/ us /ˈoʊ.ʃən/

A2 [ S ] a very large area of sea:

These mysterious creatures live at the bottom of the ocean.

[ C ] used in the name of each of the world's five main areas of sea:

the Atlantic/Pacific/Indian/Arctic/Antarctic Ocean

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Idiom(s)

(Definition of “ocean” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ocean" in American English

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oceannoun [ C/U ]

us /ˈoʊ·ʃən/

the large mass of salt water that covers most of the earth’s surface:

[ U ] These mysterious creatures live at the bottom of the ocean.

Ocean is also used in the name of the world’s five main divisions of this mass of water:

[ C ] the Atlantic/Pacific/Indian/Arctic/Antarctic Ocean
oceanic
adjective [ not gradable ] us /ˌoʊ·ʃiˈæn·ɪk/

oceanic conditions

(Definition of “ocean” from the Cambridge Academic Content Dictionary © Cambridge University Press)