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English definition of “coincidence”

coincidence

noun [C/U]  /koʊˈɪn·sɪ·dəns, -səˌdens/ us  
an occasion when two or more things happen at the same time, esp. in a way that is unexpected or unlikely, or the unlikely fact of such things happening at the same time: [C] Was our meeting here a coincidence? [U] By coincidence, both teams happen to be coached by men.
coincidental
adjective [not gradable]  /koʊˌɪn·sɪˈden·təl/ us  
Resemblances between their stories are purely coincidental.
coincidentally
adverb [not gradable]  /koʊˌɪn·sɪˈden·təl·i/ us  
Mo shut his eyes and swung, the ball and the bat coincidentally arriving at the same place at the same time.
(Definition of coincidence from the Cambridge Academic Content Dictionary © Cambridge University Press)
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