Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “ocean”


noun     /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 Grammar:Geographical placesSee more
(Definition of ocean noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of ocean

Browse related topics

You are looking at an entry to do with Seas & oceans, but you might be interested in these topics from the Seas, rivers & water topic area:

Definitions of “ocean” in other dictionaries

Word of the Day


the quality of knowing someone very well, liking them a lot, and wanting to spend a lot of time together

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