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

 

coincidentally

 adverb
adverb
BrE BrE//kəʊˌɪnsɪˈdentəli//
 
; NAmE NAmE//koʊˌɪnsɪˈdentəli//
 
 
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in a way that is not planned, but happens by chance Coincidentally, they had both studied in Paris.