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English definition of “coincidence”

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coincidence

noun uk   /kəʊˈɪn.sɪ.dəns/ us    /koʊ-/
B2 [C] an occasion when two or more similar things happen at the same time, especially in a way that is unlikely and surprising: You chose exactly the same wallpaper as us - what a coincidence! Is it just a coincidence that the wife of the man who ran the competition won first prize? a series of strange/amazing coincidencesB2 [U] chance or luck: Just by coincidence, I met my old school-mate again 50 years later. [+ that] It was pure/sheer coincidence that I remembered his phone number. By some strange coincidence, he was passing the house just when it happened.
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(Definition of coincidence from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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