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interplanetary

American  
[in-ter-plan-i-ter-ee] / ˌɪn tərˈplæn ɪˌtɛr i /

adjective

  1. being or occurring between the planets or between a planet and the sun.

interplanetary British  
/ ˌɪntəˈplænɪtərɪ, -trɪ /

adjective

  1. of, relating to, or existing between planets

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of interplanetary

First recorded in 1685–95; inter- + planetary

Vocabulary lists containing interplanetary

Lesson 2

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Genly Ai’s mission is to persuade the governments on Gethen to join a larger interplanetary coalition.

From The Wall Street Journal • Dec. 12, 2025

This approach lays the groundwork for a global and interplanetary sensing system that could reveal hidden particles and forces.

From Science Daily • Dec. 6, 2025

Decades later and after several successful interplanetary missions, Isro’s budget remains modest.

From BBC • Nov. 3, 2024

Engineered by JPL, the $5-billion Europa Clipper spacecraft is the largest interplanetary probe ever built by the space agency.

From Los Angeles Times • Oct. 9, 2024

It contained a single interplanetary shuttlecraft emblazoned with the IOI logo.

From "Ready Player One: A Novel" by Ernest Cline

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.