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coincidence

 
 
/kəʊˈɪnsɪdəns/ noun [C, U]

Definition

when two very similar things happen at the same time but there is no reason for it: an amazing/strange coincidence It was pure coincidence that we both married dentists.
coincidental
 
 
/kəʊˌɪnsɪˈdentəl/ adjective
happening by coincidence: The similarities are coincidental.
coincidentally
 
 
/kəʊˌɪnsɪˈdentəli/ adverb
(Definition of coincidence noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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