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[C] an occasion when two or more similar things happen at the same time, especially in a way that is unlikely and surprisingYou 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 coincidences
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[U] chance or luckJust by coincidence, I met my old school-mate again fifty 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.