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

  

accidentally

 adverb
adverb
BrE BrE//ˌæksɪˈdentəli//
 
; NAmE NAmE//ˌæksɪˈdentəli//
 
 
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by chance; in a way that was not planned As I turned around, I accidentally hit him in the face. The damage couldn't have been caused accidentally.