[in-si-den-tl-ee or for 1, -dent-lee]
apart or aside from the main subject of attention, discussion, etc.; by the way; parenthetically.
in an incidental manner.

1655–65; incidental + -ly Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
incidentally (ˌɪnsɪˈdɛntəlɪ)
1.  as a subordinate or chance occurrence
2.  (sentence modifier) by the way

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
College professors who are incidentally millionaires are the exception, even in
  these roseate days of the twentieth century.
Incidentally you can sometimes get free access to these if they're being
  offered by a lobby group and ask to come as an academic.
Incidentally he made the necessary qualifications of marksmanship, and later
  qualified as a sharpshooter.
Incidentally the bee, while impelled by an instinct that makes it search for
  sugar, sucks in therewith its solid sustenance.
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