interplanetary

adjective

in·​ter·​plan·​e·​tary ˌin-tər-ˈpla-nə-ˌter-ē How to pronounce interplanetary (audio)
: existing, carried on, or operating between planets
interplanetary dust
an interplanetary flight
interplanetary spacecraft

Examples of interplanetary in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Having multiple worlds all in one orbit might be handy for interplanetary travel. — Phil Plait, Scientific American, 16 Oct. 2026 This means the trajectory for DAVINCI will require relatively little energy, at least as far as interplanetary missions go. — Stephen Clark, ArsTechnica, 14 Oct. 2026 With the new moon arriving on Saturday, skies will be dark with minimal moonlight to interfere with viewing, but visibility depends on the strength of the solar wind, cloud cover, and the orientation of the interplanetary magnetic field. — Michele Laufik, Martha Stewart, 8 Oct. 2026 Future Housewives is set in the decadent asteroid colony of New Beverly Hills, where wealthy socialites juggle bioengineered beauty regimens, ruthless rivalries and interplanetary scandals. — Peter White, Deadline, 30 Sep. 2026 See All Example Sentences for interplanetary

Word History

First Known Use

1691, in the meaning defined above

Time Traveler
The first known use of interplanetary was in 1691

Rhymes for interplanetary

See All Rhymes for interplanetary

Browse Nearby Words

interplane
interplanetary
interplant
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Cite this Entry

“Interplanetary.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/interplanetary. Accessed 20 Oct. 2026.

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Kids Definition

interplanetary

adjective
in·​ter·​plan·​e·​tary
ˌint-ər-ˈplan-ə-ˌter-ē
: between planets
interplanetary space
interplanetary travel
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