Definition of extraterrestrial noun from the Oxford Advanced Learner's Dictionary

 

extraterrestrial

 noun
noun
BrE BrE//ˌekstrətəˈrestriəl//
 
; NAmE NAmE//ˌekstrətəˈrestriəl//
 
 
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(in stories) a creature that comes from another planet; a creature that may exist on another planet
See the Oxford Advanced American Dictionary entry: extraterrestrial