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

 

great

 adverb
adverb
BrE BrE//ɡreɪt//
 
; NAmE NAmE//ɡreɪt//
 
 
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(informal, non-standard) very well Well done. You did great. Word Origin Old English grēat ‘big’, of West Germanic origin; related to Dutch groot and German gross.
See the Oxford Advanced American Dictionary entry: great