happening by or resulting from coincidence; by chance: a coincidental meeting.
existing or occurring at the same time.

1790–1800; coincident + -al1

coincidentally, coincidently [koh-in-si-duhnt-lee] , adverb
noncoincidental, adjective
noncoincidentally, adverb
uncoincidental, adjective
uncoincidentally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To coincidental
World English Dictionary
coincidental (kəʊˌɪnsɪˈdɛntəl)
of or happening by a coincidence; fortuitous

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
The timing, though coincidental, could not have been better.
As rare events become less rare, you can expect coincidental occurrences of
  them to be less rare.
Optical range finders are more accurately called coincidental range finders.
Names with risqué connotations, be they deliberate or coincidental, fare a
  little better.
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