Definition of anecdotal adjective from the Oxford Advanced Learner's Dictionary

 

anecdotal

 adjective
adjective
BrE BrE//ˌænɪkˈdəʊtl//
 
; NAmE NAmE//ˌænɪkˈdoʊtl//
 
 
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based on anecdotes and possibly not true or accurate anecdotal evidence Anecdotal evidence suggests there were irregularities at the polling station on the day of the election.
See the Oxford Advanced American Dictionary entry: anecdotal