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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

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.

See Examples For:

In order to efficiently scale its satellite launches, orbital data centers and interplanetary travel ambitions, SpaceX needs to develop a fully reusable spacecraft.

From MarketWatch Jun. 6, 2026

Fast facts: The “E.T.” and “Close Encounters of the Third Kind” director Steven Spielberg revisits interplanetary life in this thriller starring Emily Blunt and Josh O’Connor as two strangers drawn together by their extraterrestrial experiences.

From The Wall Street Journal Jun. 6, 2026

"But Nandini's sari is the first object I have collected from India for our interplanetary science collection and it's our very first sari," Shindell says.

From BBC Jun. 5, 2026

A spaceship’s crew returns from a dangerous interplanetary mission and encounters fresh peril on Earth.

From The Wall Street Journal Apr. 9, 2026

Velikovsky imagined the comet, after a complicated game of interplanetary billiards, to settle down into a stable, nearly circular orbit, becoming the planet Venus—which he claimed never existed before then.

From "Cosmos" by Carl Sagan

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