Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “ocean”


noun uk   /ˈəʊ.ʃən/ us    /ˈoʊ-/
A2 [S] a very large area of sea: These mysterious creatures live at the bottom of the ocean.Seas and oceans [C] used in the name of each of the world's five main areas of sea: the Atlantic/Pacific/Indian/Arctic/Antarctic OceanSeas and oceans
(Definition of ocean from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of ocean?
Add Cambridge dictionaries to your browser to your website

Definitions of “ocean” in other dictionaries

Word of the Day


to press something quickly and quite hard between two objects, especially sharp objects such as teeth or nails

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More