CEFR C1
incidentally
adverb
Meaning
Used to introduce a piece of information that is not central to the main topic but is nevertheless relevant or interesting.
Examples
- The hotel was quite expensive, but incidentally, it offered the best breakfast in the city.
- I need to pick up some milk; incidentally, do we have enough coffee for the morning?
Synonyms: by the way, as an aside, parenthetically, en passant