adj
interplanetary
ihn-tuh-PLA-nih-tuh-ree
adj
1
Existing or occurring between planets.
"The agency is planning an interplanetary mission to Mars."
How to Use Interplanetary
Learner’s notesIn plain EnglishRelating to travel or activity that happens between planets, rather than within one solar system's single world.
Common pairings
interplanetary travel
interplanetary mission
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The agency is planning an _____ mission to Mars.
Etymology
From inter- ("between") plus planetary.