Definition of lastingly adverb from the Oxford Advanced Learner's Dictionary

 

lastingly

 adverb
adverb
BrE BrE//ˈlɑːstɪŋli//
 
; NAmE NAmE//ˈlæstɪŋli//
 
 
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in a way that continues to exist or to have an effect for a long time The show proved lastingly popular.