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coincidental

[koh-in-si-den-tl] /koʊˌɪn sɪˈdɛn tl/
adjective
1.
happening by or resulting from coincidence; by chance:
a coincidental meeting.
2.
existing or occurring at the same time.
Origin of coincidental
1790-1800
1790-1800; coincident + -al1
Related forms
coincidentally, coincidently
[koh-in-si-duh nt-lee] /koʊˈɪn sɪ dənt li/ (Show IPA),
adverb
noncoincidental, adjective
noncoincidentally, adverb
uncoincidental, adjective
uncoincidentally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for coincidental

coincidental

/kəʊˌɪnsɪˈdɛntəl/
adjective
1.
of or happening by a coincidence; fortuitous
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
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Word Origin and History for coincidental
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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17
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