Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “planetarium”

planetarium

noun [C]     /ˌplænɪˈteəriəm/ (plural planetariums, planetaria)
a building that has a machine for showing the positions and movements of the stars and planetsBuildings in generalShops, markets and auctionsRestaurants and cafesAstronomy - general words
(Definition of planetarium noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “planetarium” in other dictionaries

Word of the Day

neighbourly

friendly or helpful

Word of the Day

Blog

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