Definition of interplanetary adjective from the Oxford Advanced Learner's Dictionary

 

interplanetary

 adjective
adjective
BrE BrE//ˌɪntəˈplænɪtri//
 
; NAmE NAmE//ˌɪntərˈplænəteri//
 
[only before noun] Space travel
 
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between planets interplanetary travel See related entries: Space travel
See the Oxford Advanced American Dictionary entry: interplanetary