interplanetary

adjective

in·​ter·​plan·​e·​tary ˌin-tər-ˈpla-nə-ˌter-ē 

: 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

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

An interplanetary human race seemed only decades away, and TV was bound to explore the possibilities, though both British and American networks felt that science fiction didn’t appeal to audiences. — Neil Oseman, Space.com, 21 Sep. 2026

Introduced as Superman’s younger, wilder cousin, Kara prefers going on interplanetary benders to fighting for truth, justice and a better tomorrow. — Maira Garcia, Los Angeles Times, 18 Sep. 2026

Moonfish doesn’t quite take things to the same extremes, but there is a similar idea at play here about the unknowability of alien life and the mental strain of interplanetary travel. — Leslie Felperin, HollywoodReporter, 18 Sep. 2026

Word History

First Known Use

1691, in the meaning defined above

Rhymes for interplanetary

• beneficiary
• bronchopulmonary
• evolutionary
• expeditionary
• extramedullary
• extraordinary
• extrapulmonary
• genitourinary
• geostationary
• hepatobiliary
• illocutionary
• insurrectionary

Kids Definition

interplanetary

adjective

in·​ter·​plan·​e·​tary

ˌint-ər-ˈplan-ə-ˌter-ē

: between planets

interplanetary space

interplanetary travel