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

 

impermanent

 adjective
adjective
BrE BrE//ɪmˈpɜːmənənt//
 
; NAmE NAmE//ɪmˈpɜːrmənənt//
 
(formal)
 
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that will not last or stay the same forever opposite permanent
See the Oxford Advanced American Dictionary entry: impermanent