co·in·ci·den·tal

[koh-in-si-den-tl]
adjective
1.
happening by or resulting from coincidence; by chance: a coincidental meeting.
2.
existing or occurring at the same time.

Origin:
1790–1800; coincident + -al1

co·in·ci·den·tal·ly, co·in·ci·dent·ly [koh-in-si-duhnt-lee] , adverb
non·co·in·ci·den·tal, adjective
non·co·in·ci·den·tal·ly, adverb
un·co·in·ci·den·tal, adjective
un·co·in·ci·den·tal·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To coincidentally
00:10
Coincidentally is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
coincidental (kəʊˌɪnsɪˈdɛntəl) [Click for IPA pronunciation guide]
 
adj
of or happening by a coincidence; fortuitous

coincidentally (kəʊˌɪnsɪˈdɛntəlɪ) [Click for IPA pronunciation guide]
 
adv
(sentence modifier) by a coincidence; fortuitously

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Example sentences
None of these are going to happen in our lifetime, and probably not
  coincidentally.
The hydrogen atom has two energy levels that coincidentally seem to have the
  same energy.
It may only coincidentally line up with the other two.
Coincidentally, a department chairman had written with a similar request a few
  weeks earlier.
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