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

Its enormous lift capacity and low-cost potential could reshape satellite deployment, planetary science, and interplanetary logistics. —Kaif Shaikh, Interesting Engineering, 15 Oct. 2025

The most powerful of these events are called interplanetary coronal mass ejections, or CMEs, which travel at speeds approaching 1,800 miles per second (2,897 kilometers per second). —Mojtaba Akhavan-Tafti, The Conversation, 13 Oct. 2025

This is a novel and compelling scenario and offers a refreshing alternative to collisions from interplanetary interlopers explaining the destruction of a former Saturnian moon. —Big Think, 9 Oct. 2025

The awe-inspiring interplanetary set design in the Grand Palais conveyed the reach of it all. —Martino Carrera, Footwear News, 7 Oct. 2025

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