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

 

terrifically

 adverb
adverb
BrE BrE//təˈrɪfɪkli//
 
; NAmE NAmE//təˈrɪfɪkli//
 
(informal)
 
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extremely (usually used about positive qualities) terrifically exciting
See the Oxford Advanced American Dictionary entry: terrifically