Definition of royally adverb from the Oxford Advanced American Dictionary

 

royally

 adverb
adverb
NAmE//ˈrɔɪəli//
 
(old-fashioned)
 
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very well; in a very impressive way or to a great degree We feasted royally on salmon and champagne. I was treated royally throughout my visit.
See the Oxford Advanced Learner's Dictionary entry: royally