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coincidental

[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.
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Origin of coincidental

First recorded in 1790–1800; coincident + -al1
Related formsco·in·ci·den·tal·ly, co·in·ci·dent·ly [koh-in-si-duh nt-lee] /koʊˈɪn sɪ dənt li/, adverbnon·co·in·ci·den·tal, adjectivenon·co·in·ci·den·tal·ly, adverbun·co·in·ci·den·tal, adjectiveun·co·in·ci·den·tal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for uncoincidentally

coincidental

adjective
  1. of or happening by a coincidence; fortuitous
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for uncoincidentally

coincidental

adj.

c.1800, from coincident + -al (1).

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Online Etymology Dictionary, © 2010 Douglas Harper