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

In addition to Musk, tech leaders like OpenAI CEO Sam Altman and Amazon founder Jeff Bezos, have all spoken optimistically about humanity entering a phase of interplanetary travel within their lifetimes. — Preston Fore, Fortune, 14 July 2026

TerraFirma As SpaceX's Elon Musk sells investors on a space economy with life beyond Earth, a two-year-old construction startup founded by two of the company's former engineers is positioning itself for the future of interplanetary infrastructure. — Samantha Subin, CNBC, 14 July 2026

Its first interplanetary endeavor, Tianwen-1, saw an orbiter and a rover reach Mars in 2020. — Brett Tingley, Space.com, 7 July 2026

Gillespie envisioned his film as a kind of interplanetary road movie, with Kara Zor-El/Supergirl (Milly Alcock) teaming up with Jason Momoa’s wild bounty hunter, Lobo, in a dynamic reminiscent of Mattie Ross and Rooster Cogburn. — Jennifer Ouellette, ArsTechnica, 4 July 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