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

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for coincidentally

Contemporary Examples of coincidentally

Historical Examples of coincidentally

  • Coincidentally appears something else that may overthrow it later.

  • Coincidentally was the announcement that she was going in for light opera.

    The Monster

    Edgar Saltus

  • Coincidentally, unobserved but observant, Barouffski was also passing that way.

    The Monster

    Edgar Saltus

  • Coincidentally the political power of the Sumerians came to an end.

  • For, coincidentally with the development of the shack, the builders became something more than partners.

    Penrod and Sam

    Booth Tarkington

British Dictionary definitions for coincidentally



(sentence modifier) by a coincidence; fortuitously



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

Word Origin and History for coincidentally

1837, from coincidental + -ly (2).



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

Online Etymology Dictionary, © 2010 Douglas Harper