Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “interplanetary”


adjective [before noun]     /ˌɪn.təˈplæn.ɪ.tər.i/ US  /-ter.i/
between planets: interplanetary spaceAstronomy - general words
(Definition of interplanetary adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of interplanetary

Definitions of “interplanetary” in other dictionaries

Translations of “interplanetary”

Word of the Day

limber up

to do gentle exercises to stretch the muscles in order to prepare the body for more active physical exercise

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