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English definition of “coincidence”

coincidence

noun [C/U]    /koʊˈɪn·sɪ·dəns, -səˌdens/
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.
(Definition of coincidence noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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