Definition of interplanetary in English:

interplanetary

Syllabification: in·ter·plan·e·tar·y
Pronunciation: /ˌintərˈplaniˌterē
 
/

adjective

  • Situated or traveling between planets: interplanetary missions
    More example sentences
    • Fragments of asteroids and comets pervade interplanetary space.
    • Orion was originally designed as an interplanetary spacecraft for missions to the Moon or Mars, but the design was adapted for interstellar travel.
    • Its principal responsibilities are to support interplanetary spacecraft missions and radio and radar astronomy observations.

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