incidentally
adverb
[ ɪnsɪˈdɛnt(ə)li ]
• used to add a further comment or a remark unconnected to the current subject; by the way.
• "incidentally, it was many months before the whole truth was discovered"
Similar:
by the way,
by the by(e),
in passing,
en passant,
speaking of which,
while on the subject,
parenthetically,
BTW,
as it happens,
• in an incidental manner; as a chance occurrence.
• "the infection was discovered only incidentally at post-mortem examination"
Similar:
by chance,
by accident,
accidentally,
fortuitously,
by a fluke,
as luck would have it,
by a twist of fate,
coincidentally,
by coincidence,
by happenstance,
