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

 

galactic

 adjective
adjective
BrE BrE//ɡəˈlæktɪk//
 
; NAmE NAmE//ɡəˈlæktɪk//
 
 
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relating to a galaxy A galactic year is the time the galaxy takes to rotate once completely. Word Origin mid 19th cent.: from Greek galaktias (variant of galaxias ‘galaxy’) + -ic.
See the Oxford Advanced American Dictionary entry: galactic