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.
Its enormous lift capacity and low-cost potential could reshape satellite deployment, planetary science, and interplanetary logistics. Kaif Shaikh, Interesting Engineering, 15 Oct. 2025 The most powerful of these events are called interplanetary coronal mass ejections, or CMEs, which travel at speeds approaching 1,800 miles per second (2,897 kilometers per second). Mojtaba Akhavan-Tafti, The Conversation, 13 Oct. 2025 This is a novel and compelling scenario and offers a refreshing alternative to collisions from interplanetary interlopers explaining the destruction of a former Saturnian moon. Big Think, 9 Oct. 2025 The awe-inspiring interplanetary set design in the Grand Palais conveyed the reach of it all. Martino Carrera, Footwear News, 7 Oct. 2025 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

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Cite this Entry

“Interplanetary.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/interplanetary. Accessed 19 Oct. 2025.

Kids Definition

interplanetary

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

More from Merriam-Webster on interplanetary

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