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

Shotwell said SpaceX's existing infrastructure can't support the number or cadence of Starship launches the company anticipates reaching, and tied Starbase Louisiana to SpaceX's long-term goal of using Starship to make human life interplanetary. — Josh Dinner, Space.com, 25 Aug. 2026

Although Hal’s remit encompasses the entire interplanetary backwater that includes Earth, Lanterns takes place mostly in the rural American town of Rushville, Neb. — Judy Berman, Time, 14 Aug. 2026

Visibility depends on factors like solar wind and the interplanetary magnetic field. — Jamie Carter, Forbes.com, 2 Aug. 2026

With each successive test, Starship continues moving from experimental prototype toward the fully reusable heavy-lift launch system SpaceX believes will support its next generation of commercial, lunar, and interplanetary missions. — Kaif Shaikh, Interesting Engineering, 25 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