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

 

planetary

 adjective
adjective
BrE BrE//ˈplænətri//
 
; NAmE NAmE//ˈplænəteri//
 
[only before noun](specialist)
 
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relating to a planet or planets planetary activity a planetary system Word Origin late 16th cent.: from late Latin planetarius ‘relating to the planets’ (recorded only as a noun meaning ‘astrologer’), from planeta ‘planet’.
See the Oxford Advanced American Dictionary entry: planetary