in ‧ ci ‧ den ‧ tal ‧ ly AC /ˌɪnsəˈdent ə li, ˌɪnsɪˈdent ə li/ BrE AmE adverb
1 . [sentence adverb] used to add more information to what you have just said, or to introduce a new subject that you have just thought of SYN by the way :
Incidentally, where were you born?
The wine, incidentally, goes very well with a mature cheese.
2 . in a way that was not planned, but as a result of something else:
Quite incidentally, I got some useful information at the party.