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

  

coincidental

 adjective
adjective
BrE BrE//kəʊˌɪnsɪˈdentl//
 
; NAmE NAmE//koʊˌɪnsɪˈdentl//
 
[not usually before noun]
 
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happening by chance; not planned I suppose your presence here today is not entirely coincidental. It's purely coincidental that we both chose to call our daughters Emma.Extra examples These parallels cannot be merely coincidental. I suppose your presence here today is not entirely coincidental. It’s purely coincidental that we both chose to call our daughters Emma.
See the Oxford Advanced American Dictionary entry: coincidental