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

      

    incidentally

     adverb
    adverb
    BrE BrE//ˌɪnsɪˈdentli//
     
    ; NAmE NAmE//ˌɪnsɪˈdentli//
     
     
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  1. 1used to introduce a new topic, or some extra information, or a question that you have just thought of synonym by the way Incidentally, have you heard the news about Sue?
  2. 2in a way that was not planned but that is connected with something else The information was only discovered incidentally.
See the Oxford Advanced American Dictionary entry: incidentally