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

 

instantaneously

 adverb
adverb
BrE BrE//ˌɪnstənˈteɪniəsli//
 
; NAmE NAmE//ˌɪnstənˈteɪniəsli//
 
 
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immediately The show sold out instantaneously.