Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “outer space”

outer space

noun [U]    /ˈɑʊ·tər ˈspeɪs/
the universe beyond the earth’s atmosphere (= the air surrounding the earth).
(Definition of outer space noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of outer space

Definitions of “outer space” in other dictionaries

Word of the Day


a situation in which two people are friends

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