Definition of incidentally
1
: in an incidental manner : not intentionally
the arrant nonsense of some of his statements is incidentally hilarious— John Lahr
2
: by way of interjection or digression : by the way
fortunate in having a good teacher … —still living, incidentally— John Fischer
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Merriam-Webster unabridged
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Time Traveler for incidentally
The first known use of incidentally was in 1665
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