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

 

anecdotally

 adverb
adverb
BrE BrE//ˌænɪkˈdəʊtəli//
 
; NAmE NAmE//ˌænɪkˈdoʊtəli//
 
 
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according to a personal account of an event which is possibly not true or accurate This reaction has been reported anecdotally by a number of patients.