To save this word, you'll need to log in.
in·ter·plan·e·tary | \ ˌin-tər-ˈpla-nə-ˌter-ē 
\
\Definition of interplanetary
: existing, carried on, or operating between planets interplanetary dust an interplanetary flight interplanetary spacecraft
Keep scrolling for more
Keep scrolling for more
More Definitions for interplanetary
interplanetary
adjectiveEnglish Language Learners Definition of interplanetary
astronomy : existing or occurring between planets
See the full definition for interplanetary in the English Language Learners Dictionary
Keep scrolling for more
Comments on interplanetary
What made you want to look up interplanetary? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
July 2020 Words of the Day Quiz
- Which is a synonym of mien?
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
- July 2020 Words of the Day Quiz Take the quiz
- Difficult Spelling Words Quiz
Can you spell these 15 tricky spelling words?
Take the quiz - Spell It
Can you spell these 10 commonly misspelled words?
Take the quiz - Dictionary Devil
The dictionary has been scrambled—can you put it back together?
Play the game
Share interplanetary
Time Traveler for interplanetary
The first known use of interplanetary was in 1691
See more words from the same year